{"id":5773,"date":"2024-04-15T17:06:59","date_gmt":"2024-04-15T09:06:59","guid":{"rendered":"http:\/\/zyg.luchers.cn\/?p=5773"},"modified":"2024-04-15T17:06:59","modified_gmt":"2024-04-15T09:06:59","slug":"%e7%ac%ac%e4%b8%89%e7%ab%a0%e3%80%81%e5%85%b3%e7%b3%bb%e6%95%b0%e6%8d%ae%e5%ba%93%e6%a0%87%e5%87%86%e8%af%ad%e8%a8%80sql","status":"publish","type":"post","link":"http:\/\/zyg.luchers.cn\/index.php\/2024\/04\/15\/%e7%ac%ac%e4%b8%89%e7%ab%a0%e3%80%81%e5%85%b3%e7%b3%bb%e6%95%b0%e6%8d%ae%e5%ba%93%e6%a0%87%e5%87%86%e8%af%ad%e8%a8%80sql\/","title":{"rendered":"\u7b2c\u4e09\u7ae0\u3001\u5173\u7cfb\u6570\u636e\u5e93\u6807\u51c6\u8bed\u8a00SQL"},"content":{"rendered":"

\u7b2c\u4e09\u7ae0\u3001\u5173\u7cfb\u6570\u636e\u5e93\u6807\u51c6\u8bed\u8a00SQL<\/h1>\n

3.1\u3001SQL\u6982\u8ff0<\/h2>\n

1\u3001SQL\uff08Structured Query Language\uff09\uff1a\u7ed3\u6784\u5316\u7a0b\u5e8f\u8bed\u53e5\uff1b\u662f\u5173\u7cfb\u6570\u636e\u5e93\u7684\u6807\u51c6\u8bed\u8a00<\/p>\n

2\u3001SQL\u662f\u4e00\u4e2a\u901a\u7528\u7684\u3001\u529f\u80fd\u6781\u5f3a\u7684\u5173\u7cfb\u6570\u636e\u5e93\u8bed\u8a00<\/p>\n

3.1.1\u3001SQL\u7684\u4ea7\u751f\u548c\u53d1\u5c55<\/h3>\n

1\u3001SQL\u6807\u51c6\u7684\u8fdb\u5c55\u8fc7\u7a0b<\/h4>\n

1\u3001\u5185\u5bb9<\/p>\n

\"image-20230823222810881\"<\/div><\/p>\n

2\u3001SQL\u8bed\u8a00\u7684\u7279\u70b9<\/h4>\n

1\u3001\u7efc\u5408\u7edf\u4e00<\/h5>\n

1\u3001\u96c6\u5408\u4e86\u5b9a\u4e49\u8bed\u8a00\uff08DDL\uff09\u3001\u6570\u636e\u64cd\u7eb5\u8bed\u8a00\uff08DML\uff09\u3001\u548c\u6570\u636e\u63a7\u5236\u8bed\u8a00\uff08DCL\uff09\u4e3a\u4e00\u4f53<\/p>\n

2\u3001\u72ec\u7acb\u5b8c\u6210\u6570\u636e\u5e93\u751f\u547d\u5468\u671f\u7684\u5168\u90e8\u6d3b\u52a8\uff08\u5b9a\u4e49\u5173\u7cfb\u6a21\u5f0f\u3001\u63d2\u5165\u6570\u636e\u3001\u5efa\u7acb\u6570\u636e\u5e93\u3001\u6570\u636e\u66f4\u65b0\u3001\u91cd\u6784\u548c\u7ef4\u62a4\u3001\u5b89\u5168\u6027\u3001\u5b8c\u6574\u6027\uff09<\/p>\n

3\u3001\u7528\u6237\u6570\u636e\u8fd0\u884c\u540e\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u6c42\u968f\u65f6\u66f4\u6539<\/p>\n

4\u3001\u6570\u636e\u64cd\u4f5c\u7b26\u7edf\u4e00<\/p>\n

2\u3001\u9ad8\u5ea6\u975e\u8fc7\u7a0b\u5316<\/h5>\n

1\u3001\u975e\u5173\u7cfb\u6570\u636e\u6a21\u578b\u7684\u6570\u636e\u64cd\u7eb5\u8bed\u8a00\u662f\u201c\u9762\u5411\u8fc7\u7a0b\u201d\uff0c\u5fc5\u987b\u5236\u5b9a\u5b58\u53d6\u8def\u5f84<\/p>\n

2\u3001SQL\u53ea\u8981\u201c\u505a\u662f\u4ec0\u4e48\u201d\uff0c\u8def\u5f84\u76f8\u5173\u5185\u5bb9\u4e0d\u9700\u8981\u4e86\u89e3<\/p>\n

3\u3001\u5b58\u53d6\u8def\u5f84\u64cd\u4f5c\u8fc7\u7a0b\uff0c\u7531\u7cfb\u7edf\u5b8c\u6210<\/p>\n

3\u3001\u9762\u5411\u96c6\u5408\u7684\u64cd\u4f5c\u65b9\u5f0f<\/h5>\n

1\u3001\u975e\u5173\u7cfb\u6570\u636e\u6a21\u578b\u9762\u5411\u8bb0\u5f55\u7684\u64cd\u4f5c\u65b9\u5f0f\uff0c\u64cd\u4f5c\u5bf9\u8c61\u662f\u4e00\u6761\u8bb0\u5f55<\/p>\n

2\u3001SQL\u91c7\u7528\u96c6\u5408\u7684\u64cd\u4f5c\u65b9\u5f0f<\/p>\n

3\u3001\u64cd\u4f5c\u3001\u67e5\u8be2\u53ef\u4ee5\u662f\u5143\u7ec4\u7684\u96c6\u5408<\/p>\n

4\u3001\u4e00\u6b21\u63d2\u5165\u3001\u5220\u9664\u3001\u66f4\u65b0\u64cd\u4f5c\u7684\u5bf9\u8c61\u53ef\u4ee5\u662f\u5143\u7ec4\u7684\u96c6\u5408<\/p>\n

4\u3001\u4ee5\u4e00\u79cd\u8bed\u6cd5\u7ed3\u6784\u63d0\u4f9b\u591a\u79cd\u4f7f\u7528\u65b9\u5f0f<\/h5>\n

1\u3001\u662f\u72ec\u7acb\u7684\u8bed\u8a00\uff0c\u80fd\u591f\u72ec\u7acb\u7528\u4e8e\u8054\u673a\u4ea4\u4e92\u7684\u4f7f\u7528\u65b9\u5f0f<\/p>\n

2\u3001SQL\u662f\u5d4c\u5165\u5f0f\u8bed\u8a00\uff0c\u53ef\u4ee5\u5d4c\u5165\u5230\u9ad8\u7ea7\u8bed\u8a00\uff0c\u8ba9\u7a0b\u5e8f\u8bbe\u8ba1\u65f6\u4f7f\u7528<\/p>\n

5\u3001\u8bed\u8a00\u7b80\u5355\uff0c \u6613\u5b66\u6613\u7528<\/h5>\n

1\u3001\u529f\u80fd\u6781\u5f3a\uff0c\u53ea\u75289\u4e2a\u52a8\u8bcd<\/p>\n

2\u3001\u56fe\u793a<\/p>\n

\"image-20230823224815262\"<\/div><\/p>\n

3.1.2\u3001SQL\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n

1\u3001\u4e09\u7ea7\u6a21\u5f0f\u7ed3\u6784<\/h4>\n

1\u3001SQL\u652f\u6301\u5173\u7cfb\u6570\u636e\u5e93\u4e09\u7ea7\u6a21\u5f0f\u7ed3\u6784<\/p>\n

2\u3001\u56fe\u793a<\/p>\n

\"image-20230823230507575\"<\/div><\/p>\n

2\u3001\u57fa\u672c\u8868<\/h4>\n

1\u3001\u672c\u8eab\u72ec\u7acb\u5b58\u5728\u7684\u8868<\/p>\n

2\u3001SQL\u4e2d\u4e00\u4e2a\u5173\u7cfb\u5c31\u5bf9\u5e94\u4e00\u4e2a\u57fa\u672c\u8868<\/p>\n

3\u3001\u4e00\u4e2a\uff08\u6216\u591a\u4e2a\uff09\u57fa\u672c\u8868\u5bf9\u5e94\u4e00\u4e2a\u5b58\u50a8\u6587\u4ef6<\/p>\n

4\u3001\u4e00\u4e2a\u8868\u53ef\u4ee5\u5e26\u82e5\u5e72\u7d22\u5f15<\/p>\n

3\u3001\u5b58\u50a8\u6587\u4ef6<\/h4>\n

1\u3001\u903b\u8f91\u7ed3\u6784\u7ec4\u6210\u4e86\u5173\u7cfb\u6570\u636e\u5e93\u7684\u5185\u6a21\u5f0f<\/p>\n

2\u3001\u7269\u7406\u7ed3\u6784\u662f\u4efb\u610f\u7684\uff0c\u5bf9\u7528\u6237\u900f\u660e<\/p>\n

4\u3001\u89c6\u56fe<\/h4>\n

1\u3001\u4ece\u4e00\u4e2a\u6216\u51e0\u4e2a\u57fa\u672c\u8868\u5bfc\u51fa\u7684\u8868<\/p>\n

2\u3001\u6570\u636e\u5e93\u4e2d\u53ea\u5b58\u653e\u89c6\u56fe\u7684\u5b9a\u4e49\u800c\u4e0d\u5b58\u653e\u89c6\u56fe\u5bf9\u5e94\u7684\u6570\u636e<\/p>\n

3\u3001\u89c6\u56fe\u662f\u4e00\u4e2a\u865a\u8868<\/p>\n

4\u3001\u7528\u6237\u53ef\u4ee5\u5728\u89c6\u56fe\u4e0a\u518d\u5b9a\u4e49\u89c6\u56fe<\/p>\n

3.2\u3001\u5b66\u751f\u2014\u8bfe\u7a0b\u6570\u636e\u5e93<\/h2>\n

1\u3001\u5b66\u751f\u2014\u8bfe\u7a0b\u6a21\u5f0fS-T<\/h4>\n

2\u3001\u5b66\u751f\u8868\uff1aStudent\uff08Sno\/Sname\/Ssex\/Sage\/Sdept\uff09<\/h4>\n

\"image-20230823231429656\"<\/div><\/p>\n

3\u3001\u8bfe\u7a0b\u8868\uff1aCourse(Cno\/Cname\/Cpno\/Ccredit)<\/h4>\n

\"image-20230823231513199\"<\/div><\/p>\n

4\u3001\u5b66\u751f\u9009\u8bfe\u8868\uff1aSC(Sno\/Cno\/Crade)<\/h4>\n

\"image-20230823231617966\"<\/div><\/p>\n

3.3\u3001\u6570\u636e\u5b9a\u4e49<\/h2>\n

1\u3001\u5b9a\u4e49\u529f\u80fd\uff1a\u6a21\u5f0f\u5b9a\u4e49\u3001\u8868\u5b9a\u4e49\u3001\u89c6\u56fe\u548c\u7d22\u5f15\u7684\u5b9a\u4e49<\/p>\n

2\u3001\u5185\u5bb9\u5305\u62ec<\/p>\n

\"image-20230823231830690\"<\/div><\/p>\n

3.3.1\u3001\u6a21\u5f0f\u7684\u5b9a\u4e49\u4e0e\u5220\u9664<\/h3>\n

1\u3001\u6a21\u5f0f\u5b9a\u4e49<\/h4>\n

1\u3001\u8bed\u53e5\u683c\u5f0f<\/p>\n

CREATE SCHEMA<\u6a21\u5f0f\u540d> AUTHORIZATION<\u7528\u6237\u540d>;<\/code><\/pre>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230823232200913\"<\/div><\/p>\n
3\u3001\u5982\u679c\u6ca1\u6709\u5b9a\u4e49\u6a21\u5f0f\u540d\uff0c\u90a3\u4e48\u6a21\u5f0f\u540d\u9ed8\u8ba4\u4e3a\uff0c\u7528\u6237\u540d<\/p>\n
4\u3001CREATE SCHEMA\u4e2d\u53ef\u4ee5\u63a5\u53d7CREATE TABLE; CREATE VIEW\u548cGRANT\u5b50\u53e5\uff0c\u683c\u5f0f\u5982\u4e0b<\/p>\n
\"image-20230823232512311\"<\/div><\/p>\n
5\u3001\u4f8b\u5b50<\/p>\n
\"image-20230823232550900\"<\/div><\/p>\n
6\u3001\u6267\u884c\u521b\u5efa\u6a21\u5f0f\u8bed\u53e5\u5fc5\u987b\u62e5\u6709DBA\u6743\u9650\uff08\u6570\u636e\u5e93\u7ba1\u7406\u5458\u6743\u9650\uff09\u3001\u6216\u8005DBA\u6388\u4e88\u5728CREATE SCHEMA\u7684\u6743\u9650<\/p>\n
2\u3001\u5220\u9664\u6a21\u5f0f<\/h4>\n
1\u3001\u683c\u5f0f<\/h5>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/p>\n
DROP SCHEMA<\u6a21\u5f0f\u540d><CASCADE|RESTRICT>;<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001CASCADE\u548cRESTRICT\u5fc5\u987b\u4e8c\u9009\u4e00<\/p>\n
2\u3001CASCADE(\u7ea7\u522b)\uff1a\u5220\u9664\u6a21\u5f0f\u7684\u540c\u65f6\u5e76\u628a\u6570\u636e\u5220\u9664<\/p>\n
3\u3001RESTRICT(\u9650\u5236)\uff1a\u5982\u679c\u8be5\u6a21\u5f0f\u5185\u6709\u6570\u636e\u5e93\u5bf9\u8c61\uff08\u89c6\u56fe\u3001\u8868\u7b49\uff09\u5c31\u5fc5\u987b\u6e05\u7406\u4e86\u624d\u80fd\u6267\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u5426\u5219\u4f1a\u62a5\u9519<\/p>\n
4\u3001\u4f8b\u5b50<\/p>\n
\"image-20230823233052422\"<\/div><\/p>\n
3.3.2\u3001\u57fa\u672c\u8868\u7684\u5b9a\u4e49\u3001\u5220\u9664\u4e0e\u4fee\u6539<\/h3>\n
1\u3001\u5b9a\u4e49\u57fa\u672c\u8868<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
CREATE TABLE<\u8868\u547d\u540d>\n(<\u5217\u540d><\u6570\u636e\u7c7b\u578b>[<\u5217\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6>],\n[<\u5217\u540d><\u6570\u636e\u7c7b\u578b>[<\u5217\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6>]],<\u8868\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6>])<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u5982\u679c\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u8bbe\u8ba1\u5230\u8be5\u8868\u7684\u591a\u4e2a\u5c5e\u6027\u5217\uff0c\u5219\u5fc5\u987b\u5b9a\u4e49\u5728\u8868\u7ea7\u522b\u4e0a\uff0c\u5426\u5219\u5373\u53ef\u4ee5\u5b9a\u4e49\u5728\u5217\u7ea7\u4e5f\u53ef\u4ee5\u5b9a\u4e49\u5728\u8868\u7ea7<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230825092355121\"<\/div><\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230825092757064\"<\/div><\/p>\n
4\u3001\u4f8b\u5b50<\/p>\n
\"image-20230825093326489\"<\/div><\/p>\n
2\u3001\u6570\u636e\u7c7b\u578b<\/h4>\n
1\u3001\u5e38\u7528\u6570\u636e\u7c7b\u578b<\/p>\n
\"image-20230825093743594\"<\/div><\/p>\n
3\u3001\u6a21\u5f0f\u4e0e\u8868<\/h4>\n
1\u3001\u5185\u5bb9<\/h5>\n
1\u3001\u6bcf\u4e2a\u57fa\u672c\u8868\u90fd\u5c5e\u4e8e\u67d0\u4e00\u4e2a\u6a21\u5f0f\uff08\u7c7b\u4f3c\u4e8e\u6743\u9650\uff09\uff0c\u4e00\u4e2a\u6a21\u5f0f\u5305\u542b\u591a\u4e2a\u57fa\u672c\u8868<\/p>\n
2\u3001\u521b\u5efa\u57fa\u672c\u8868\uff08\u5176\u4ed6\u6570\u636e\u5e93\u5bf9\u8c61\u4e5f\u4e00\u6837\uff09\uff0c\u82e5\u6ca1\u6709\u6307\u5b9a\u6a21\u5f0f\uff0c\u7cfb\u7edf\u4f1a\u6839\u636e\u641c\u7d22\u8def\u5f84\u6765\u786e\u5b9a\u8be5\u5bf9\u8c61\u6240\u5c5e\u7684\u6a21\u5f0f<\/p>\n
3\u3001\u5f53\u524d\u6240\u5728\u641c\u7d20\u8def\u5f84\uff1a<\/p>\n
SHOW search_path;<\/code><\/pre>\n
4\u3001\u641c\u7d22\u8def\u5f84\u5f53\u524d\u9ed8\u8ba4\u503c<\/p>\n
$user,PUBLIC;<\/code><\/pre>\n
5\u3001DBA\u7528\u6237\u53ef\u4ee5\u8bbe\u7f6e\u641c\u7d22\u8def\u5f84<\/p>\n
SET search_path TO "S-T",PUBLIC;<\/code><\/pre>\n
6\u3001\u82e5\u641c\u7d22\u8def\u5f84\u4e2d\u6a21\u5f0f\u540d\u4e0d\u5b58\u5728\uff0c \u7cfb\u7edf\u5219\u4f1a\u62a5\u9519<\/p>\n
7\u3001\u82e5\u641c\u7d22\u8def\u5f84\u4e2d\u5b58\u5728\u6a21\u5f0f\uff0cRDBMS\u4f1a\u4f7f\u7528\u6a21\u5f0f\u5217\u8868\u7684\u7b2c\u4e00\u4e2a\u5728\u7684\u6a21\u5f0f\u4f5c\u4e3a\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u6a21\u5f0f\u540d<\/p>\n
2\u3001\u521b\u5efa\u57fa\u672c\u8868<\/h5>\n
1\u3001\u521b\u5efa\u8868\u65f6\u7ed9\u51fa\u6a21\u5f0f\u540d<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230825094659674\"<\/div><\/p>\n
2\u3001\u521b\u5efa\u6a21\u5f0f\u7684\u540c\u65f6\u521b\u5efa\u8868<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230825094821031\"<\/div><\/p>\n
3\u3001\u8bbe\u7f6e\u6240\u5c5e\u6a21\u5f0f\uff0c\u5728\u521b\u5efa\u8868\u540d\u4e2d\u4e0d\u5fc5\u7ed9\u51fa\u6a21\u5f0f\u540d<\/p>\n
\"image-20230825094916798\"<\/div><\/p>\n
4\u3001\u603b\u7ed3\uff1a\u6a21\u5f0f\u76f8\u5f53\u4e8e\u4ed3\u5e93\uff0c\u8868\u76f8\u5f53\u4e8e\u4ed3\u5e93\u4e2d\u5b58\u653e\u7684\u96f6\u4ef6\uff0c\u53ef\u4ee5\u628a\u6a21\u5f0f\u6388\u6743\u7ed9\u7ba1\u7406\u5458\uff0c\u8ba9\u7ba1\u7406\u5458\u5bf9\u8868\u8fdb\u884c\u7ba1\u7406\u3001\u4e09\u79cd\u5efa\u8868\u65b9\u5f0f<\/p>\n
4\u3001\u4fee\u6539\u57fa\u672c\u8868<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
\"image-20230829200851207\"<\/div><\/p>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001<\u8868\u540d>\u662f\u8981\u4fee\u6539\u7684\u57fa\u672c\u8868<\/p>\n
2\u3001ADD\u5b50\u53e5\uff0c\u7528\u4e8e\u589e\u52a0\u65b0\u5217\uff0c\u65b0\u7684\u5217\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6\u548c\u65b0\u7684\u8868\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6<\/p>\n
3\u3001DROP COLUMN\u5b50\u53e5\u7528\u4e8e\u5220\u9664\u8868\u4e2d\u7684\u5217<\/p>\n
4\u3001\u5982\u679c\u6307\u5b9a\u4e86CASCADE\u8bed\u53e5\uff1a\u5c31\u4e0d\u7ba1\u8868\u5185\u6570\u636e\uff0c\u5168\u90e8\u5220\u9664<\/p>\n
5\u3001\u5982\u679c\u6307\u5b9a\u4e86RESTRICT\u8bed\u53e5\uff1a\u5982\u679c\u8868\u5185\u6709\u6570\u636e\uff0c\u5c31\u4f1a\u5220\u9664\u5931\u8d25\uff0c\u5e76\u62a5\u9519<\/p>\n
6\u3001DROP CONSTRAINT\u5b50\u53e5\uff0c\u7528\u4e8e\u5220\u9664\u6307\u5b9a\u7684\u5b8c\u6574\u6027\u7ea6\u675f<\/p>\n
7\u3001ALTER COLUMN\u5b50\u53e5\uff0c\u7528\u4e8e\u4fee\u6539\u539f\u6709\u7684\u5217\u5b9a\u4e49\uff0c\u5305\u62ec\u4fee\u6539\u5217\u540d\u548c\u6570\u636e\u7c7b\u578b<\/p>\n
3\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230829201800635\"<\/div><\/p>\n
5\u3001\u5220\u9664\u57fa\u672c\u8868<\/h4>\n
1\u3001\u683c\u5f0f<\/h5>\n
DROP TABLE <\u8868\u540d> [RESTRICT|CASCADE];<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u57fa\u672c\u8868\u88ab\u5220\u9664\uff0c\u6570\u636e\u88ab\u5220\u9664\uff0c\u8868\u4e0a\u5efa\u7acb\u7684\u7d22\u5f15\u3001\u89c6\u56fe\u3001\u89e6\u53d1\u5668\u7b49\u4e5f\u4e00\u822c\u88ab\u5220\u9664<\/p>\n
3\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230829202259523\"<\/div><\/p>\n
4\u3001DROP TABLE\u65f6\uff0cSQL2011\u4e0e3\u4e2aRDBMS\u7684\u5904\u7406\u7b56\u7565\u6bd4\u8f83<\/h5>\n
\"image-20230829203058451\"<\/div><\/p>\n
3.3.3\u3001\u7d22\u5f15\u7684\u5efa\u7acb\u4e0e\u5220\u9664<\/h3>\n
1\u3001\u6982\u5ff5<\/h4>\n
1\u3001\u5efa\u7acb\u7d22\u5f15\u7684\u76ee\u7684\uff1a\u52a0\u5feb\u67e5\u8be2\u901f\u5ea6<\/p>\n
2\u3001\u8c01\u80fd\u5efa\u7acb\u7d22\u5f15\uff1aDBA\u6216\u8868\u7684\u5c5e\u4e3b\uff08\u5373\u5efa\u7acb\u8868\u7684\u4eba\uff09<\/p>\n
3\u3001DBMS\u4f1a\u81ea\u52a8\u5efa\u7acb\u4ee5\u4e0b\u7d22\u5f15<\/p>\n
PRIMARY KEY\nUNIQUE<\/code><\/pre>\n
4\u3001\u8c01\u7ef4\u62a4\u7d22\u5f15\uff1aDBMS\u81ea\u52a8\u5b8c\u6210<\/p>\n
5\u3001\u4f7f\u7528\u7d22\u5f15\uff1aDBMS\u81ea\u52a8\u9009\u62e9\u662f\u5426\u4f7f\u7528\u7d22\u5f15\u54ea\u4e9b\u7d22\u5f15<\/p>\n
6\u3001RDBMS\u4e2d\u7684\u5b9e\u73b0\uff1aB+\u6811\u3001HASH\u7d22\u5f15\uff0cB+\u6811\u5177\u6709\u52a8\u6001\u7a33\u5b9a\u4f18\u70b9\uff1bHASH\u5177\u6709\u5feb\u901f\u67e5\u627e\u7279\u70b9<\/p>\n
7\u3001\u7d22\u5f15\u662f\u5171\u4eab\u6570\u636e\u5e93\u5185\u90e8\u5b9e\u73b0\u6280\u672f\uff0c\u5c5e\u4e8e\u5185\u6a21\u5f0f\u8303\u7574<\/p>\n
8\u3001CREATE INDEX\u8bed\u53e5\u5b9a\u4e49\u7d22\u5f15\u65f6\uff0c\u53ef\u4ee5\u5b9a\u4e49\u7d22\u5f15\u662f\u552f\u4e00\u7d22\u5f15\u3001\u975e\u552f\u4e00\u7d22\u5f15\u3001\u805a\u7c07\u7d22\u5f15<\/p>\n
2\u3001\u5efa\u7acb\u7d22\u5f15<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
\"image-20230829204628065\"<\/div><\/p>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001UNIQUE\u8868\u660e\u6b64\u7d22\u5f15\u6bcf\u4e00\u4e2a\u7d22\u5f15\u503c\u53ea\u5bf9\u5e94\u552f\u4e00\u7684\u6570\u636e<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829210212050\"<\/div><\/p>\n
3\u3001CLUSTER\u8868\u793a\u8981\u5efa\u7acb\u7684\u7d22\u5f15\u662f\u805a\u7c07\u7d22\u5f15\u3002\u805a\u7c07\u7d22\u5f15\u662f\u6307\u7d22\u5f15\u987a\u5e8f\u548c\u8868\u4e2d\u8bb0\u5f55\u7684\u7269\u7406\u987a\u5e8f\u4e00\u81f4<\/strong>\u7684\u7d22\u5f15\u7ec4\u7ec7\uff08\u805a\u7c07\u7d22\u5f15\u7684\u7269\u7406\u5b58\u50a8\u5730\u5740\u548c\u8868\u4e2d\u8bb0\u5f55\u987a\u5e8f\u662f\u4e00\u81f4\u7684\uff09<\/p>\n
4\u3001\u5728\u7ecf\u5e38\u67e5\u8be2\u7684\u5217\u5efa\u7acb\u805a\u7c07\u7d22\u5f15\uff0c\u7528\u6765\u63d0\u9ad8\u67e5\u8be2\u6548\u7387<\/p>\n
5\u3001\u4e00\u4e2a\u8868\u6700\u591a\u53ea\u80fd\u5efa\u7acb\u4e00\u4e2a\u805a\u7c07\u7d22\u5f15<\/p>\n
6\u3001\u7ecf\u5e38\u66f4\u65b0\u7684\u5217\u4e0d\u5b9c\u5efa\u7acb\u805a\u7c07\u7d22\u5f15<\/p>\n
3\u3001\u5220\u9664\u7d22\u5f15<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
DROP INDEX<\u7d22\u5f15\u540d>;<\/code><\/pre>\n
1\u3001\u5220\u9664\u7d22\u5f15\u65f6\uff0c\u7cfb\u7edf\u4f1a\u4ece\u6570\u636e\u5b57\u5178\u4e2d\u5220\u53bb\u6709\u5173\u8be5\u7d22\u5f15\u7684\u63cf\u8ff0<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829212522172\"<\/div><\/p>\n
3.3.4\u3001\u6570\u636e\u5b57\u5178<\/h3>\n
1\u3001\u662f\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u5185\u90e8\u7684\u4e00\u7ec4\u7cfb\u7edf\u8868<\/p>\n
2\u3001\u8bb0\u5f55\u4e86\u6570\u636e\u5e93\u4e2d\u6240\u6709\u5b9a\u4e49\u4fe1\u606f\uff0c\u5305\u62ec\u6a21\u5f0f\u5b9a\u4e49\u3001\u89c6\u56fe\u5b9a\u4e49\u3001\u7d22\u5f15\u5b9a\u4e49\u3001\u5b8c\u6574\u6027\u7ea6\u675f\u5b9a\u4e49\u3001\u5404\u7c7b\u7528\u6237\u5bf9\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u6743\u9650\u3001\u7edf\u8ba1\u4fe1\u606f\u7b49<\/p>\n
3\u3001RDBMS\u6267\u884cSql\u6570\u636e\u5b9a\u4e49\u65f6\uff0c\u5b9e\u9645\u5c31\u662f\u66f4\u65b0\u6570\u636e\u5b57\u5178<\/p>\n
3.4\u3001\u6570\u636e\u67e5\u8be2<\/h2>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/p>\n
\"image-20230829213244774\"<\/div><\/p>\n
2\u3001\u6ce8\u610f<\/p>\n
\u2460\u8bed\u53e5\u4e2d\u5b57\u6bcd\u4e0d\u533a\u5206\u5927\u5c0f\u5199<\/p>\n
\u2461\u8bed\u53e5\u4e2d\u7684\u3010,   ;\u3011\u5fc5\u987b\u662f\u82f1\u6587\u534a\u89d2<\/p>\n
\u2462[]\u4e2d\u4e0d\u662f\u5fc5\u987b\u5b9e\u73b0\u7684\u8bed\u53e5<\/p>\n
3.4.1\u3001\u5355\u8868\u67e5\u8be2<\/h3>\n
1\u3001\u529f\u80fd\uff1a\u5bf9\u4e00\u4e2a\u8868\u7684\u5185\u5bb9\u8fdb\u884c\u67e5\u8be2<\/p>\n
1\u3001\u9009\u62e9\u8868\u4e2d\u7684\u82e5\u5e72\u5217<\/h4>\n
1\u3001\u67e5\u8be2\u6307\u5b9a\u5217<\/h5>\n
1\u3001\u683c\u5f0f\uff1a\u5728SELECT \u540e\u9762\u6307\u5b9a\u5217\u540d\uff0cFROM \u540e\u9762\u6307\u5b9a\u5217\u6240\u5728\u7684\u8868\u540d<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
2\u3001\u67e5\u8be2\u5168\u90e8\u5217<\/h5>\n
1\u3001\u529f\u80fd\uff1a\u9009\u51fa\u8868\u4e2d\u6240\u6709\u5c5e\u6027\u5217<\/p>\n
2\u3001\u683c\u5f0f\uff1aSELECT \u5173\u952e\u5b57\u540e+\u5217\u540d    \u6216\u8005    SELECT * FROM XXXX(\u8868)<\/p>\n
3\u3001\u67e5\u8be2\u7ecf\u8fc7\u8ba1\u7b97\u7684\u503c<\/h5>\n
1\u3001\u529f\u80fd\uff1a\u9009\u51fa\u8868\u4e2d\u6307\u5b9a\u7684\u5c5e\u6027\u5217\uff0c\u5e76\u7ecf\u8fc7\u8ba1\u7b97\u540e\u8f93\u51fa<\/p>\n
2\u3001\u683c\u5f0f\uff1aSELECT\u5b50\u53e5\u7684<\u76ee\u6807\u5217\u8868\u8fbe\u5f0f>\u53ef\u4ee5\u4e3a<\/p>\n
\u2460\u7b97\u672f\u8868\u8fbe\u5f0f<\/p>\n
\u2461\u5b57\u7b26\u4e32\u5e38\u91cf<\/p>\n
\u2462\u51fd\u6570<\/p>\n
\u2463\u5217\u522b\u540d<\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829215016694\"<\/div><\/p>\n
2\u3001\u9009\u62e9\u8868\u4e2d\u7684\u82e5\u5e72\u5143\u7ec4\uff08\u884c\uff09<\/h4>\n
1\u3001\u6d88\u9664\u53d6\u503c\u91cd\u590d\u7684\u884c<\/h5>\n
1\u3001\u5982\u679c\u6ca1\u6709\u6307\u5b9aDISTINCT\u5173\u952e\u8bcd\uff0c\u5219\u7f3a\u7701\u4e3aALL<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829215731094\"<\/div><\/p>\n
2\u3001\u67e5\u8be2\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4<\/h5>\n
1\u3001\u53ef\u4ee5\u901a\u8fc7where\u5b50\u53e5\u5b9e\u73b0\uff0c\u67e5\u8be2\u6761\u4ef6\u5982\u4e0b<\/p>\n
\"image-20230829220303693\"<\/div><\/p>\n
1\u3001\u6bd4\u8f83\u5927\u5c0f<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230829222645566\"<\/div><\/p>\n
2\u3001\u786e\u5b9a\u8303\u56f4<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230829222831894\"<\/div><\/p>\n
3\u3001\u786e\u5b9a\u96c6\u5408<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230829222932880\"<\/div><\/p>\n
4\u3001\u5b57\u7b26\u5339\u914d<\/p>\n
\u2460\u8bf4\u660e\uff1a\u5339\u914d\u4e32\u4e3a\u56fa\u5b9a\u5b57\u7b26\u4e32<\/p>\n
\u2461\u683c\u5f0f<\/p>\n
[NOT] LIKE '<\u5339\u914d\u4e32>' [ESCAPE '<\u6362\u7801\u5b57\u7b26>']<\/code><\/pre>\n
\u2462\u4f8b\u5b50<\/p>\n
\"image-20230829223224184\"<\/div><\/p>\n
\u2463\u5339\u914d\u4e32\u4e3a\u542b\u6709\u901a\u914d\u7b26\u7684\u5b57\u7b26\u4e32\uff1a<\/p>\n
\u2464\u3010%\u3011\uff1a\u662f\u4efb\u610f\u957f\u5ea6\u7684\u5b57\u7b26<\/p>\n
\u2465\u3010_\u3011\uff1a\u8868\u793a\u4efb\u610f\u7684\u4e00\u4e2a\u5b57\u7b26<\/p>\n
\u2466\u4f8b\u5b50<\/p>\n
\"image-20230829223618283\"<\/div><\/p>\n
\u2467\u4f7f\u7528\u6362\u7801\u5b57\u7b26\u5c06\u901a\u914d\u7b26\u8f6c\u4e49\u4e3a\u666e\u901a\u5b57\u7b26<\/p>\n
\u5c31\u662f\u7528\\+\u9700\u8981\u8f6c\u4e49\u7684\u5b57\u7b26<\/p>\n
\"image-20230829224640639\"<\/div><\/p>\n
5\u3001\u6d89\u53ca\u7a7a\u503c\u7684\u67e5\u8be2<\/p>\n
\u2460\u683c\u5f0f<\/p>\n
IS NULL \u6216 NOT NULL<\/code><\/pre>\n
\u2461\u4f8b\u5b50<\/p>\n
\"image-20230829224650705\"<\/div><\/p>\n
6\u3001\u591a\u91cd\u6761\u4ef6\u67e5\u8be2<\/p>\n
\u2460\u7528\u903b\u8f91\u8fd0\u7b97\u7b26AND \u548cOR \u6765\u8054\u7ed3\u591a\u4e2a\u67e5\u8be2\u5bf9\u8c61\uff1band\u4f18\u5148\u7ea7\u9ad8\u4e8eor\uff0c\u53ef\u4ee5\u7528\u62ec\u53f7\u6539\u53d8<\/p>\n
\u2461\u4f8b\u5b50<\/p>\n
\"image-20230829225238785\"<\/div><\/p>\n
3\u3001ORDER BY \u5b50\u53e5<\/h4>\n
1\u3001\u53ef\u4ee5\u6309\u4e00\u4e2a\u6216\u591a\u4e2a\u5c5e\u6027\u6392\u5e8f<\/p>\n
2\u3001\u5347\u5e8f\uff1aASC<\/p>\n
3\u3001\u964d\u5e8f\uff1aDESC<\/p>\n
4\u3001\u7f3a\u7701\u503c\u9ed8\u8ba4\u4e3a\uff1a\u5347\u5e8f<\/p>\n
5\u3001\u5f53\u6392\u5e8f\u5217\u542b\u6709\u7a7a\u503c\uff08null\uff09\u65f6\uff1a\u9ed8\u8ba4\u4e3a\u6700\u5927\u503c<\/p>\n
6\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829225730761\"<\/div><\/p>\n
4\u3001\u805a\u96c6\u51fd\u6570<\/h4>\n
1\u3001\u5185\u5bb9<\/h5>\n
\"image-20230829230015217\"<\/div><\/p>\n
2\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230829231523996\"<\/div><\/p>\n
3\u3001\u6ce8\u610f<\/h5>\n
1\u3001where\u6761\u4ef6\u8bed\u53e5\u4e2d\u4e0d\u80fd\u4f7f\u7528\u805a\u5408\u51fd\u6570<\/p>\n
5\u3001GROUP BY \u5b50\u53e5<\/h4>\n
1\u3001\u4f5c\u7528<\/h5>\n
1\u3001\u6309\u6307\u5b9a\u7684\u4e00\u5217\u6216\u591a\u5217\u5206\u7ec4\uff0c\u503c\u76f8\u7b49\u7684\u4e3a\u4e00\u7ec4\uff0c\u6765\u7ec6\u5316\u805a\u96c6\u51fd\u6570\u7684\u4f5c\u7528\u5bf9\u8c61<\/p>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u672a\u5bf9\u67e5\u8be2\u7ed3\u679c\u5206\u7ec4\uff0c\u805a\u96c6\u51fd\u6570\u5c06\u4f5c\u7528\u4e8e\u6574\u4e2a\u67e5\u8be2\u7ed3\u679c<\/p>\n
2\u3001\u5bf9\u67e5\u8be2\u7ed3\u679c\u5206\u7ec4\u540e\uff0c\u805a\u96c6\u51fd\u6570\u5c06\u5206\u522b\u4f5c\u7528\u4e8e\u6bcf\u4e2a\u7ec4<\/p>\n
3\u3001\u5982\u679c\u7528group by \u5206\u7ec4\uff0c\u90a3\u4e48\u53ea\u80fd\u6709\u4e24\u79cd\u60c5\u51b5<\/p>\n
\u2460\u662fgroup by \u540e\u7684\u5185\u5bb9<\/p>\n
\u2461\u662f\u805a\u5408\u51fd\u6570<\/p>\n
\u2462\u4f8b\u5b50<\/p>\n
\"image-20230829232241576\"<\/div><\/p>\n
4\u3001GROUP BY \u5b50\u53e5\u5206\u7ec4\u540e\uff0c\u53ef\u4ee5\u7528HAVING\u77ed\u8bed\u6765\u6307\u5b9a\u7b5b\u9009\u6761\u4ef6<\/p>\n
\u2460\u4f8b\u5b50<\/p>\n
\"image-20230829232522088\"<\/div><\/p>\n
3\u3001HAVING\u77ed\u8bed\u548cWHERE\u5b50\u53e5\u7684\u533a\u522b<\/h5>\n
1\u3001\u4f5c\u7528\u5bf9\u8c61\u4e0d\u540c<\/strong><\/p>\n
\u2460WHERE\u4f5c\u7528\u4e8e\u57fa\u8868\u6216\u89c6\u56fe<\/p>\n
\u2461HAVING\u77ed\u8bed\u4f5c\u7528\u4e8e\u7ec4\uff0c\u4ece\u4e2d\u9009\u62e9\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7ec4<\/p>\n
2\u3001WHERE\u53e5\u5b50\u4e2d\u662f\u4e0d\u80fd\u4f7f\u7528\u805a\u5408\u51fd\u6570\u4f5c\u4e3a\u6761\u4ef6\u8868\u8fbe\u5f0f<\/strong><\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230829232858425\"<\/div><\/p>\n
3.4.2\u3001\u8fde\u63a5\u67e5\u8be2<\/h3>\n
1\u3001\u7b49\u503c\u4e0e\u975e\u7b49\u503c\u8fde\u63a5\u67e5\u8be2<\/h4>\n
1\u3001where\u5b50\u53e5\u7528\u6765\u8fde\u63a5\u4e24\u4e2a\u8868\u7684\u6761\u4ef6\u79f0\u4e3a\u8fde\u63a5\u8c13\u8bcd<\/p>\n
2\u3001\u4e24\u4e2a\u683c\u5f0f<\/h5>\n
\u6ce8\u610f<\/p>\n
1\u3001\u7b26\u53f7\u4e3a=\u65f6\uff1a\u7b49\u503c\u8fde\u63a5\uff1b\u5176\u4ed6\u4e3a\u975e\u7b49\u503c\u8fde\u63a5<\/p>\n
2\u3001\u5176\u4e2d\u5217\u540d\u79f0\u7684\u5b57\u7b26\u7c7b\u578b\u5fc5\u987b\u4e00\u6837\uff0c\u540d\u5b57\u53ef\u4ee5\u4e0d\u4e00\u6837<\/p>\n
\"image-20230830212459314\"<\/div><\/p>\n
2\u3001\u6267\u884c\u65b9\u6cd5\uff1a\u5d4c\u5957\u5faa\u73af\u6cd5\uff08NESTED-LOOP\uff09<\/h5>\n
1\u3001\u4f5c\u4e3a\u4e86\u89e3<\/p>\n
2\u3001\u4ece\u8868\u4e00\u4e2d\u627e\u7b2c\u4e00\u4e2a\u5143\u7ec4\uff0c\u7136\u540e\u626b\u63cf\u8868\u4e8c\uff0c\u627e\u5230\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5143\u7ec4\uff0c\u5c31\u62fc\u63a5\u8d77\u6765<\/p>\n
3\u3001\u5c31\u4e00\u76f4\u5faa\u73af\uff0c\u76f4\u5230\u5168\u90e8\u627e\u5b8c<\/p>\n
2\u3001\u81ea\u7136\u8fde\u63a5<\/h4>\n
1\u3001\u82e5\u5728\u7b49\u503c\u8fde\u63a5\u4e2d\u628a\u76ee\u6807\u5217\u91cd\u590d\u7684\u5c5e\u6027\u5217\u53bb\u6389<\/p>\n
2\u3001\u5efa\u8bae\u5199\u7684\u65f6\u5019\u5c3d\u91cf\u591a\u4f7f\u7528\uff1a\u8868.\u5217\u540d<\/p>\n
3\u3001\u81ea\u8eab\u8fde\u63a5<\/h4>\n
1\u3001\u5b9a\u4e49<\/h5>\n
1\u3001\u4e00\u4e2a\u8868\u4e0e\u81ea\u8eab\u8fde\u63a5<\/p>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u9700\u8981\u7ed9\u8868\u53d6\u4e00\u4e2a\u522b\u540d\u7528\u6765\u533a\u522b<\/p>\n
2\u3001\u56e0\u4e3a\u6240\u6709\u8868\u76f8\u540c\uff0c\u6240\u4ee5\u5fc5\u987b\u4f7f\u7528\u8868\u7684\u524d\u7f00<\/p>\n
\"image-20230830214104943\"<\/div><\/p>\n
4\u3001\u5916\u8fde\u63a5<\/h4>\n
1\u3001\u666e\u901a\u8fde\u63a5\u548c\u5916\u8fde\u63a5\u7684\u533a\u522b<\/h5>\n
1\u3001\u666e\u901a\u8fde\u63a5\uff1a\u8f93\u51fa\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u5143\u7ec4<\/p>\n
2\u3001\u5916\u8fde\u63a5\uff1a\u6307\u5b9a\u8868\u4f4d\u8fde\u63a5\u4e3b\u4f53\uff0c\u5c06\u4e3b\u4f53\u8868\u4e2d\u4e0d\u6ee1\u8db3\u7684\u5143\u7ec4\u4e00\u8d77\u8f93\u51fa<\/p>\n
3\u3001\u4e0d\u6ee1\u8db3\u7684\u5143\u7ec4\u79f0\u4e3a\uff1a\u60ac\u6d6e\u5143\u7ec4<\/p>\n
4\u3001\u5916\u8fde\u63a5\u5206\u4e3a<\/h5>\n
1\u3001\u5de6\u5916\u8fde\u63a5<\/p>\n
\u2460\u683c\u5f0f<\/p>\n
LEFT OUT JOIN SC ON<\/code><\/pre>\n
\u2461\u5c31\u662f\u5de6\u8868\u4e2d\u7684\u60ac\u6d6e\u5143\u7ec4\u4e5f\u52a0\u8fdb\u6765\uff0c\u6240\u6709\u7684\u5143\u7ec4<\/p>\n
2\u3001\u53f3\u5916\u8fde\u63a5<\/p>\n
\u2460\u683c\u5f0f<\/p>\n
RIGHT OUT JOIN SC ON<\/code><\/pre>\n
\u2461\u5c31\u662f\u53f3\u8868\u4e2d\u7684\u60ac\u6d6e\u5143\u7ec4\u4e5f\u52a0\u8fdb\u6765\uff0c\u6240\u6709\u7684\u5143\u7ec4<\/p>\n
\"image-20230830214803165\"<\/div><\/p>\n
5\u3001\u591a\u8868\u8fde\u63a5<\/h4>\n
1\u3001\u5b9a\u4e49<\/h5>\n
1\u3001\u4e24\u4e2a\u4ee5\u4e0a\u7684\u8868\u8fdb\u884c\u8fde\u63a5<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830215043306\"<\/div><\/p>\n
3.4.3\u3001\u5d4c\u5957\u67e5\u8be2<\/h3>\n
1\u3001\u4e00\u4e2aSELECT-FROM-WHERE\u8bed\u53e5\u79f0\u4e3a\u4e00\u4e2a\u67e5\u8be2\u5757<\/p>\n
1\u3001\u5b9a\u4e49<\/h4>\n
1\u3001\u5c06\u4e00\u4e2a\u67e5\u8be2\u5757\u5d4c\u5957\u5728\u53e6\u5916\u4e00\u4e2a\u67e5\u8be2\u5757\u7684WHERE\u5b50\u53e5\uff0cHAVING\u77ed\u8bed\u7684\u6761\u4ef6\u4e2d\u67e5\u8be2<\/p>\n
2\u3001\u8bf4\u660e<\/h4>\n
1\u3001\u5b50\u67e5\u8be2\u4e2d\u4e0d\u80fd\u4f7f\u7528ORDER BY \u5b50\u53e5<\/p>\n
2\u3001\u5c42\u6b21\u5d4c\u5957\u65b9\u5f0f\u53cd\u6620\u4e86SQL\u8bed\u8a00\u7684\u7ed3\u6784\u5316<\/p>\n
3\u3001\u6709\u4e9b\u5d4c\u5957\u67e5\u8be2\u53ef\u4ee5\u7528\u8fde\u63a5\u8fd0\u7b97\u66ff\u4ee3<\/p>\n
4\u3001\u5916\u5c42\u67e5\u8be2\uff08\u7236\u67e5\u8be2\uff09\u3001\u5185\u5c42\u67e5\u8be2\uff08\u5b50\u67e5\u8be2\uff09<\/p>\n
\"image-20230830220246858\"<\/div><\/p>\n
3\u3001\u5e26\u6709IN\u8c13\u8bcd\u7684\u5b50\u67e5\u8be2<\/h4>\n
1\u3001\u5b50\u67e5\u8be2\u662f\u4e00\u4e2a\u96c6\u5408\uff0c\u7528IN\u8c13\u8bcd\u8868\u793a\u7236\u67e5\u8be2\u6761\u4ef6\u5728\u5b50\u67e5\u8be2\u7ed3\u679c\u7684\u96c6\u5408\u4e2d<\/p>\n
1\u3001\u4f8b\u5b50\uff1a\u67e5\u8be2\u4e0e\u201c\u5218\u6668\u201d\u5728\u540c\u4e00\u4e2a\u7cfb\u5b66\u4e60\u7684\u5b66\u751f<\/h5>\n
1\u3001\u65b9\u6cd5\u4e00<\/p>\n
\"image-20230830220744000\"<\/div><\/p>\n
2\u3001\u65b9\u6cd5\u4e8c<\/p>\n
\"image-20230830220750945\"<\/div><\/h5>\n
2\u3001\u4f8b\u5b50\uff1a\u67e5\u8be2\u9009\u4fee\u4e86\u8bfe\u7a0b\u540d\u4e3a\u201c\u4fe1\u606f\u7cfb\u7edf\u201d\u7684\u5b66\u751f\u5b66\u53f7\u548c\u59d3\u540d<\/h5>\n
1\u3001\u65b9\u6cd5\u4e00\uff1a\u5d4c\u5957\u67e5\u8be2<\/p>\n
\"image-20230830221138948\"<\/div><\/p>\n
2\u3001\u8fde\u63a5\u67e5\u8be2<\/p>\n
\"image-20230830221149995\"<\/div><\/p>\n
3\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u4e0d\u76f8\u5173\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u7684\u67e5\u8be2\u6761\u4ef6\u4e0d\u4f9d\u8d56\u4e8e\u7236\u67e5\u8be2<\/p>\n
2\u3001\u76f8\u5173\u5b50\u67e5\u8be2\uff1a\u5b50\u67e5\u8be2\u7684\u67e5\u8be2\u6761\u4ef6\u4f9d\u8d56\u7236\u67e5\u8be2\uff0c\u5d4c\u5957\u67e5\u8be2<\/p>\n
4\u3001\u5e26\u6709\u6bd4\u8f83\u8fd0\u7b97\u7b26\u7684\u5b50\u67e5\u8be2<\/h4>\n
1\u3001\u53ef\u4ee5\u6362\u6210\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/p>\n
1\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230830221609235\"<\/div><\/p>\n
5\u3001\u5e26\u6709ANY(SOME)\u6216ALL\u7684\u5b50\u67e5\u8be2<\/h4>\n
1\u3001\u8bed\u4e49<\/h5>\n
1\u3001ANY\u2014\u4efb\u610f\u4e00\u4e2a\u503c<\/p>\n
2\u3001ALL\u2014\u6240\u6709\u503c<\/p>\n
2\u3001\u9700\u8981\u914d\u5408\u4f7f\u7528\u7684\u6bd4\u8f83\u8fd0\u7b97\u7b26<\/h5>\n
\"image-20230830222115816\"<\/div><\/p>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830222740903\"<\/div><\/p>\n
3\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u805a\u96c6\u51fd\u6570\u5b9e\u73b0\u5b50\u67e5\u8be2\u6bd4\u76f4\u63a5\u7528ANY\u3001ALL\u6548\u7387\u66f4\u9ad8<\/p>\n
2\u3001ANY\u3001ALL\u8c13\u8bcd\u7528\u805a\u96c6\u51fd\u6570\u3001IN\u8c13\u8bcd\u7684\u7b49\u4ef7\u8f6c\u6362\u5173\u7cfb\u5982\u4e0b\u767d\u54e6<\/p>\n
\"image-20230830222913730\"<\/div><\/p>\n
6\u3001\u5e26\u6709EXISTS\u8c13\u8bcd\u7684\u5b50\u67e5\u8be2<\/h4>\n
1\u3001EXISTS\u8c13\u8bcd<\/h5>\n
1\u3001\u5b58\u5728\u91cf\u8bcd\u2203\uff0c\u8fd4\u56de\u7684\u903b\u8f91\u4e3aTRUE\u6216FALSE<\/p>\n
2\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230830231158042\"<\/div><\/p>\n
3\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u4f7f\u7528EXISTS\u540e\uff0c\u82e5\u5185\u5c42\u7ed3\u679c\u975e\u7a7a\uff0c\u5219\u5916\u5c42\u7ed3\u679c\u4e3aTRUE\uff0c\u5426\u5219\u4e3aFALSE<\/p>\n
2\u3001 \u56e0\u4e3aEXISTS\u67e5\u8be2\u7ed3\u679c\u6ca1\u6709\u503c\u7684\u610f\u4e49\uff0c\u6240\u4ee5\u5b50\u67e5\u8be2\u76ee\u6807\u5217\u8868\u90fd\u7528*\u8868\u793a<\/p>\n
4\u3001NOT EXISTS\u8c13\u8bcd<\/h5>\n
1\u3001\u8bf4\u660e<\/p>\n
\u2460\u975e\u7a7a\uff0c\u5219\u4e3aFALSE<\/p>\n
\u2461\u7a7a\uff0c\u5219\u4e3aTRUE<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830231305906\"<\/div><\/p>\n
5\u3001\u4e0d\u540c\u5f62\u5f0f\u7684\u67e5\u8be2\u95f4\u7684\u66ff\u6362<\/h5>\n
1\u3001\u4e00\u4e9bEXISTS\u6216NOT EXISTS\u8c13\u8bcd\u5b50\u67e5\u8be2\u4e0d\u80fd\u88ab\u5176\u4ed6\u5f62\u5f0f\u5b50\u67e5\u8be2\u7b49\u4ef7\u66ff\u4ee3<\/p>\n
2\u3001\u6240\u6709\u5e26IN\u8c13\u8bcd\u3001\u6bd4\u8f83\u8fd0\u7b97\u7b26\u3001ANY\u548cALL\u8c13\u8bcd\u7684\u5b50\u67e5\u8be2\u90fd\u80fd\u88ab\u5e26EXISTS\u8c13\u8bcd\u7684\u5b50\u67e5\u8be2\u7b49\u4ef7\u4ea4\u6362<\/p>\n
6\u3001EXISTS\/NOT EXISTS\u5b9e\u73b0\u5168\u79f0\u91cf\u8bcd<\/h5>\n
1\u3001SQL\u8bed\u53e5\u6ca1\u6709\u5168\u79f0\u91cf\u8bcd\uff08\u7c7b\u4f3cALL\uff09\u3002\u53ef\u4ee5\u628a\u5e26\u6709\u5168\u79f0\u91cf\u8bcd\u7684\u8c13\u8bcd\u8f6c\u6362\u4e3a\u7b49\u4ef7\u7684\u5e26\u6709\u5b58\u5728\u91cf\u8bcd\u7684\u8c13\u8bcd<\/p>\n
2\u3001\u4e3e\u4f8b<\/p>\n
\"image-20230830232721653\"<\/div><\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830233335137\"<\/div><\/p>\n
7\u3001\u7528EXISTS\/NOT EXISTS\u5b9e\u73b0\u903b\u8f91\u8574\u542b<\/h5>\n
1\u3001SQL\u6ca1\u6709\u8574\u542b\uff08\u5145\u5206\u6761\u4ef6\uff09\u7684\u903b\u8f91\u8fd0\u7b97\uff0c\u53ef\u4ee5\u5229\u7528\u8c13\u8bcd\u6f14\u7b97\u5c06\u903b\u8f91\u8574\u542b\u8c13\u8bcd\u7b49\u4ef7\u4ea4\u6362\u4e3a\uff1a<\/p>\n
\"image-20230830233605807\"<\/div><\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830234142769\"<\/div><\/p>\n
3.4.4\u3001\u96c6\u5408\u67e5\u8be2<\/h3>\n
1\u3001\u79cd\u7c7b\uff1a\u5e76\u64cd\u4f5c\u3001\u4ea4\u64cd\u4f5c\u3001\u5dee\u64cd\u4f5c<\/p>\n
1\u3001\u5e76\u64cd\u4f5cUNION<\/h4>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230830234423122\"<\/div><\/p>\n
2\u3001UNION\uff1a\u7cfb\u7edf\u4f1a\u81ea\u52a8\u53bb\u91cd\u5143\u7ec4<\/p>\n
3\u3001UNION ALL \uff1a\u7cfb\u7edf\u4f1a\u4fdd\u7559\u91cd\u590d\u5143\u7ec4<\/p>\n
4\u3001UNION\u76f8\u5f53\u4e8eor\u64cd\u4f5c<\/p>\n
2\u3001\u4ea4\u64cd\u7eb5INTERSECT<\/h4>\n
1\u3001INTERSECT\uff1a\u76f8\u5f53\u4e8eand\u64cd\u4f5c<\/p>\n
\"image-20230830234921209\"<\/div><\/p>\n
3\u3001\u5dee\u64cd\u4f5cEXCEPT<\/h4>\n
1\u3001\u8bf4\u660e\uff1a\u53c2\u4e0e\u96c6\u5408\u64cd\u4f5c\u7684\u5404\u9879\u67e5\u8be2\u7ed3\u679c\u7684\u5217\u6570\u5fc5\u987b\u76f8\u540c\uff1b\u5bf9\u5e94\u9879\u7684\u6570\u636e\u7c7b\u578b\u4e5f\u5fc5\u987b\u76f8\u540c<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901081745411\"<\/div><\/p>\n
3.4.5\u3001\u57fa\u4e8e\u6d3e\u751f\u8868\u7684\u67e5\u8be2<\/h3>\n
1\u3001\u4ecb\u7ecd<\/h4>\n
1\u3001\u5b50\u67e5\u8be2\u53ef\u4ee5\u51fa\u73b0\u5728WHERE\u5b50\u53e5\u4e2d\uff0c\u8fd8\u53ef\u4ee5\u51fa\u73b0\u5728FROM\u5b50\u53e5\u4e2d\uff0c\u8fd9\u65f6\u5b50\u67e5\u8be2\u751f\u6210\u4e34\u65f6\u6d3e\u751f\u8868\uff0c\u6210\u4e3a\u4e3b\u67e5\u8be2\u7684\u67e5\u8be2\u5bf9\u8c61<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901082552006\"<\/div><\/p>\n
3\u3001\u8865\u5145\uff1a\u901a\u8fc7FROM\u5b50\u53e5\u751f\u6210\u6d3e\u751f\u8868\u7684\u65f6\u5019\uff0cAS\u5173\u952e\u5b57\u53ef\u4ee5\u7701\u7565\uff0c\u4f46\u5fc5\u987b\u4e3a\u6d3e\u751f\u8868\u751f\u6210\u4e00\u4e2a\u522b\u540d<\/p>\n
3.4.6\u3001SELECT\u8bed\u53e5\u7684\u4e00\u822c\u683c\u5f0f<\/h3>\n
1\u3001\u683c\u5f0f<\/h4>\n
\"image-20230901083232427\"<\/div><\/p>\n
3.5\u3001\u6570\u636e\u66f4\u65b0<\/h2>\n
3.5.1\u3001\u63d2\u5165\u6570\u636e<\/h3>\n
1\u3001\u63d2\u5165\u5143\u7ec4<\/h4>\n
1\u3001\u683c\u5f0f<\/h5>\n
INSERT INTO <\u8868\u540d> [(<\u5c5e\u6027\u52171>[,<\u5c5e\u6027\u52172>]\u2026\u2026)]\nVALUES(<\u5e38\u91cf1>[,<\u5e38\u91cf2>]\u2026\u2026)<\/code><\/pre>\n
2\u3001\u529f\u80fd<\/h5>\n
1\u3001\u5c06\u65b0\u5143\u7ec4\u63d2\u5165\u6307\u5b9a\u8868\u4e2d\uff08\u65b0\u884c\u63d2\u5165\u8868\u4e2d\uff09<\/p>\n
3\u3001\u8bf4\u660e<\/h5>\n
1\u3001INTO\u5b50\u53e5\uff1a\u5c5e\u6027\u5217\u53ef\u4ee5\u548c\u8868\u4e2d\u987a\u5e8f\u4e0d\u4e00\u81f4\uff0c\u6ca1\u6709\u6307\u5b9a\u5c5e\u6027\u5217\u7684\u9ed8\u8ba4\u63d2\u5165\u5168\u90e8<\/p>\n
2\u3001VALUES\u5b50\u53e5\uff1a\u503c\u5fc5\u987b\u548cINTO\u5b50\u53e5\u5339\u914d\uff0c\u503c\u548c\u5c5e\u6027\u5217\u7684\u6570\u636e\u7c7b\u578b\u9700\u8981\u4e00\u76f4<\/strong><\/p>\n
3\u3001\u5982\u679c\u63d2\u5165\u7684\u5c5e\u6027\u6ca1\u6709\u8d4b\u503c\uff0c\u5219\u5728\u81ea\u52a8\u8d4bNULL\uff0c\u4e3b\u7801\u5fc5\u987b\u6709\u503c\uff0c\u4e14\u4e0d\u80fd\u91cd\u590d<\/p>\n
4\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901084243648\"<\/div><\/p>\n
2\u3001\u63d2\u5165\u5b50\u67e5\u8be2\u7ed3\u679c<\/h4>\n
1\u3001\u683c\u5f0f<\/h5>\n
INSERT INTO <\u8868\u540d> [(<\u5c5e\u6027\u52171>[,<\u5c5e\u6027\u52172>]\u2026\u2026)]\u2026\u2026\n\u5b50\u67e5\u8be2;<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u5c31\u662f\u5c06\u5b50\u67e5\u8be2\u7684\u7ed3\u679c\u63d2\u5165\u5230\u6307\u5b9a\u8868\u4e2d<\/p>\n
2\u3001SELECT\u76ee\u6807\u5217\u5fc5\u987b\u548cINTO\u5339\u914d\uff0c\u503c\u7684\u4e2a\u6570\u3001\u7c7b\u578b\u4e00\u81f4<\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901085709745\"<\/div><\/p>\n
3.5.2\u3001\u4fee\u6539\u6570\u636e<\/h3>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h4>\n
UPDATE<\u8868\u540d>\nSET <\u5217\u540d>=<\u8868\u8fbe\u5f0f>[,<\u5217\u540d>=<\u8868\u8fbe\u5f0f>]\u2026\u2026[WHERE<\u6761\u4ef6>];<\/code><\/pre>\n
2\u3001\u529f\u80fd<\/h4>\n
1\u3001\u4fee\u6539\u6307\u5b9a\u8868\u4e2d\u6ee1\u8db3WHERE\u5b50\u53e5\u6761\u4ef6\u7684\u5143\u7ec4<\/p>\n
3\u3001\u8bf4\u660e<\/h4>\n
1\u3001SET\u5b50\u53e5\uff1a\u6307\u5b9a\u4fee\u6539\u65b9\u5f0f\uff0c\u4fee\u6539\u7684\u5217\uff0c\u4fee\u6539\u540e\u7684\u53d6\u503c<\/p>\n
2\u3001WHERE\u5b50\u53e5\uff1a\u6307\u5b9a\u8981\u4fee\u6539\u7684\u5143\u7ec4\uff0c\u7f3a\u7701\u8868\u793a\u4fee\u6539\u6240\u6709\u7684\u5143\u7ec4<\/p>\n
3\u3001\u5728\u6267\u884c\u4fee\u6539\u8bed\u53e5\u65f6\uff0c\u4f1a\u68c0\u67e5\u4fee\u6539\u64cd\u4f5c\u662f\u5426\u7834\u574f\u8868\u5df2\u5b9a\u4e49\u7684\u5b8c\u6574\u6027\u89c4\u5219<\/p>\n
4\u3001\u4fee\u6539\u67d0\u4e00\u4e2a\u5143\u7ec4\u7684\u503c<\/h4>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901091508558\"<\/div><\/p>\n
5\u3001\u4fee\u6539\u591a\u4e2a\u5143\u7ec4\u7684\u503c<\/h4>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901091506086\"<\/div><\/p>\n
6\u3001\u5e26\u5b50\u67e5\u8be2\u7684\u4fee\u6539\u8bed\u53e5<\/h4>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901091503300\"<\/div><\/p>\n
3.5.3\u3001\u5220\u9664\u6570\u636e<\/h3>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h4>\n
DELETE FROM <\u8868\u540d> [WHERE <\u6761\u4ef6>];<\/code><\/pre>\n
2\u3001\u529f\u80fd<\/h4>\n
1\u3001\u5220\u9664\u6307\u5b9a\u8868\u4e2d\u6ee1\u8db3WHERE\u5b50\u53e5\u6761\u4ef6\u7684\u5143\u7ec4<\/p>\n
3\u3001\u8bf4\u660e<\/h4>\n
1\u3001WHERE\u5b50\u53e5\uff1a\u6307\u5b9a\u8981\u5220\u9664\u7684\u5143\u7ec4\uff0c\u7f3a\u7701\u8868\u793a\u8981\u5220\u9664\u8868\u4e2d\u7684\u6240\u6709\u5143\u7ec4\uff0c\u8868\u8fbe\u5b9a\u4e49\u4f9d\u7136\u5728<\/p>\n
4\u3001\u4f8b\u5b50<\/h4>\n
1\u3001\u5220\u9664\u67d0\u4e00\u4e2a\u5143\u7ec4\u7684\u503c<\/h5>\n
\"image-20230901092326281\"<\/div><\/p>\n
2\u3001\u5220\u9664\u591a\u4e2a\u5143\u7ec4\u7684\u503c<\/h5>\n
\"image-20230901092322387\"<\/div><\/p>\n
3\u3001\u5e26\u5b50\u67e5\u8be2\u7684\u5220\u9664\u8bed\u53e5<\/h5>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901092319622\"<\/div><\/p>\n
2\u3001\u5220\u9664\u8be5\u8868\u5143\u7ec4\uff0c\u4e5f\u9700\u8981\u5c06\u8be5\u8868\u7684\u76f8\u5173\u7684\u5143\u7ec4\u5220\u9664<\/p>\n
3.6\u3001\u7a7a\u503c\u7684\u5904\u7406<\/h2>\n
1\u30013.6.1\u3001\u5185\u5bb9\u4ecb\u7ecd<\/h3>\n
1\u3001\u7a7a\u503c\u5b58\u5728\u53d6\u503c\u4e0d\u786e\u5b9a\u6027\uff0c\u5bf9\u5173\u7cfb\u8fd0\u7b97\u4f1a\u5e26\u6765\u95ee\u9898\uff0c\u9700\u8981\u7279\u6b8a\u5904\u7406<\/p>\n
1\u3001SQL\u5141\u8bb8\u7a7a\u503c\u7684\u4e09\u79cd\u60c5\u51b5<\/h4>\n
1\u3001\u8be5\u5c5e\u6027\u6709\u503c\uff0c\u4f46\u4e0d\u77e5\u9053\u5b83\u7684\u5177\u4f53\u503c<\/p>\n
2\u3001\u8be5\u5c5e\u6027\u4e0d\u5e94\u8be5\u6709\u503c<\/p>\n
3\u3001\u67d0\u79cd\u539f\u56e0\u4e0d\u4fbf\u4e8e\u586b\u5199<\/p>\n
2\u3001\u7a7a\u503c\u7684\u4ea7\u751f<\/h4>\n
1\u3001\u6570\u636e\u6ca1\u6709\u586b\u5199<\/p>\n
\"image-20230901093316210\"<\/div><\/p>\n
3\u3001\u7a7a\u503c\u7684\u5224\u65ad<\/h4>\n
1\u3001\u4f7f\u7528IS NULL<\/strong> \u6216 IS NOT NULL<\/strong>\u6765\u8868\u793a<\/p>\n
4\u3001\u7a7a\u503c\u7684\u7ea6\u675f\u6761\u4ef6<\/h4>\n
1\u3001\u5c5e\u6027\u5b9a\u4e49\uff08\u57df\u5b9a\u4e49\uff09\u4e3aNOT NULL\u7ea6\u675f\u6761\u4ef6\uff0c\u5219\u4e0d\u80fd\u6dfb\u52a0NULL<\/p>\n
2\u3001\u52a0\u4e86UNIQUE\u9650\u5236\u7684\u5c5e\u6027\u4e0d\u80fd\u53d6\u7a7a\u503c<\/p>\n
3\u3001\u7801\u5c5e\u6027\u4e0d\u80fd\u53d6\u7a7a\u503c<\/p>\n
5\u3001\u7a7a\u503c\u7684\u7b97\u672f\u8fd0\u7b97\u3001\u6bd4\u8f83\u8fd0\u7b97\u3001\u903b\u8f91\u8fd0\u7b97<\/h4>\n
1\u3001\u7b97\u672f\u8fd0\u7b97<\/h5>\n
1\u3001\u7a7a\u503c\u4e0e\u53e6\u4e00\u4e2a\u503c\uff08\u4e5f\u5305\u62ec\u7a7a\u503c\uff09\u8fd0\u7b97\u7ed3\u679c\u4e3aNULL<\/p>\n
2\u3001\u6bd4\u8f83\u8fd0\u7b97<\/h5>\n
1\u3001\u7a7a\u503c\u4e0e\u53e6\u4e00\u4e2a\u503c\uff08\u4e5f\u5305\u62ec\u7a7a\u503c\uff09\u6bd4\u8f83\u7ed3\u679c\u4e3a\uff1aUNKNOWN<\/p>\n
3\u3001\u903b\u8f91\u8fd0\u7b97<\/h5>\n
1\u3001\u5982\u56fe<\/p>\n
\"image-20230901094131690\"<\/div><\/p>\n
2\u3001\u5176\u4e2dT\uff1a\u4e3aTRUE<\/p>\n
3\u3001\u5176\u4e2dF\uff1a\u4e3aFALSE<\/p>\n
4\u3001\u5176\u4e2dU\uff1a\u4e3aUNKNOWN<\/p>\n
5\u3001UNKNOWN\uff0c\u7684\u975e\u4e5f\u662f\uff0cUNKNOWN<\/p>\n
6\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901094752340\"<\/div><\/p>\n
3.7\u3001\u89c6\u56fe<\/h2>\n
3.7.1\u3001\u7279\u70b9<\/h3>\n
1\u3001\u662f\u865a\u8868\uff0c\u4ece\u4e00\u4e2a\u6216\u51e0\u4e2a\u57fa\u672c\u8868\u5bfc\u51fa\u7684<\/p>\n
2\u3001\u503c\u5b58\u653e\u89c6\u56fe\u7684\u5b9a\u4e49\uff0c\u4e0d\u5b58\u653e\u89c6\u56fe\u5bf9\u5e94\u7684\u7533\u8bc9\u5c40<\/p>\n
3\u3001\u8868\u4e2d\u7684\u6570\u636e\u53d1\u751f\u53d8\u5316\uff0c\u5b9e\u4f53\u4e2d\u7a0b\u5e8fch\u7684\u6570\u636e\u4e5f\u968f\u4e4b\u6539\u53d8<\/p>\n
3.7.2\u3001\u57fa\u4e8e\u89c6\u56fe\u7684\u64cd\u4f5c<\/h3>\n
1\u3001\u67e5\u8be2\u3001\u5220\u9664\u3001\u53d7\u9650\u66f4\u65b0\u3001\u5b9a\u4e49\u57fa\u4e8e\u8be5\u89c6\u56fe\u7684\u65b0\u89c6\u56fe<\/p>\n
3.7.3\u3001\u5b9a\u4e49\u89c6\u56fe<\/h3>\n
1\u3001\u5efa\u7acb\u89c6\u56fe<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
CREATE VIEW<\u89c6\u56fe\u540d> [(<\u5217\u540d>[,<\u5217\u540d>]\u2026\u2026)] AS <\u5b50\u67e5\u8be2> [WITH CHECK OPTION];<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u7ec4\u6210\u89c6\u56fe\u7684\u5c5e\u6027\u5217\u540d\uff1a\u5168\u90e8\u7701\u7565\u6216\u6307\u5b9a<\/p>\n
2\u3001\u5b50\u67e5\u8be2\u4e0d\u5141\u8bb8\u6709ORDER BY \u548c DISTINCT\u77ed\u8bed<\/p>\n
3\u3001RDBMS\u6267\u884cCREATE VIEW \u8bed\u53e5\u662f\uff0c\u53ea\u662f\u628a\u89c6\u56fe\u5b9a\u4e49\u63d2\u5165\u6570\u636e\uff0c\u5e76\u4e0d\u6267\u884c\u5176\u4e2d\u7684SELECT\u96e8\u5177<\/p>\n
4\u3001\u5728\u5bf9\u89c6\u56fe\u67e5\u8be2\u65f6\uff0c\u6309\u89c6\u56fe\u7684\u5b9a\u4e49\u4ece\u57fa\u672c\u8868\u5316\u603b\u5c06\u6570\u636e\u67e5\u51fa<\/p>\n
5\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901111222187\"<\/div><\/p>\n
3\u3001\u57fa\u4e8e\u591a\u4e2a\u57fa\u8868\u7684\u89c6\u56fe<\/h5>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901111618892\"<\/div><\/p>\n
4\u3001\u57fa\u4e8e\u89c6\u56fe\u7684\u89c6\u56fe<\/h5>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901111836941\"<\/div><\/p>\n
5\u3001\u5e26\u8868\u8fbe\u5f0f\u7684\u89c6\u56fe<\/h5>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901112115552\"<\/div><\/p>\n
6\u3001\u5206\u7ec4\u89c6\u56fe<\/h5>\n
1\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901112329828\"<\/div><\/p>\n
7\u3001\u4e0d\u6307\u5b9a\u5c5e\u6027\u5217<\/h5>\n
1\u3001\u6ce8\u610f\uff1a\u5982\u679c\u57fa\u672c\u8868\u7684\u5217\u548c\u89c6\u56fe\u7684\u5217\u6620\u50cf\u5173\u7cfb\u88ab\u7834\u574f\uff0c\u89c6\u56fe\u5219\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901112532597\"<\/div><\/p>\n
2\u3001\u5220\u9664\u89c6\u56fe<\/h4>\n
1\u3001\u8bed\u53e5\u683c\u5f0f<\/h5>\n
DROP VIEW<\u89c6\u56fe\u540d> [CASCADE];#\u8fde\u6839\u62d4\u8d77<\/code><\/pre>\n
2\u3001\u8bf4\u660e<\/h5>\n
1\u3001\u5220\u9664\u7684\u662f\u6307\u89c6\u56fe\u7684\u5b9a\u4e49<\/p>\n
2\u3001\u5982\u679c\u8be5\u89c6\u56fe\u548c\u5176\u4ed6\u89c6\u56fe\u6709\u5173\u7cfb\uff0c\u4f7f\u7528CASCADE\u7ea7\u8054\u5220\u9664\u8bed\u53e5\uff0c\u6240\u6709\u6709\u5173\u7cfb\u7684\u89c6\u56fe\u90fd\u4f1a\u88ab\u5220\u9664<\/p>\n
3\u3001\u5982\u679c\u8981\u5220\u9664\u57fa\u672c\u8868\uff0c\u5219\u7531\u8be5\u8868\u5bfc\u51fa\u7684\u89c6\u56fe\u5b9a\u4e49\u5fc5\u987b\u7528DROP VIEW \u5220\u9664\u8bed\u53e5\u8fdb\u884c\u5220\u9664\uff08\u7cfb\u7edf\u4e0d\u4f1a\u81ea\u52a8\u5220\u9664\uff09<\/p>\n
4\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901113226879\"<\/div><\/p>\n
3.7.4\u3001\u67e5\u8be2\u89c6\u56fe<\/h3>\n
1\u3001\u89c6\u56fe\u5b9a\u4e49\u540e\uff0c\u7528\u6237\u5c31\u53ef\u4ee5\u50cf\u57fa\u672c\u8868\u4e00\u6837\u5bf9\u89c6\u56fe\u8fdb\u884c\u67e5\u8be2\u4e86<\/p>\n
1\u3001RDBMS\u5b9e\u73b0\u89c6\u56fe\u67e5\u8be2\u7684\u65b9\u6cd5\u2014\u89c6\u56fe\u6d88\u89e3\u6cd5<\/h4>\n
1\u3001\u662f\u8ba9\u4f60\u77e5\u9053\u6570\u636e\u5e93\u4fe1\u606f\u7cfb\u7edf\u4f1a\u81ea\u52a8\u5b9e\u73b0\u89c6\u56fe\u6d88\u89e3\u6cd5<\/p>\n
1\u3001\u4e09\u6b65\u9aa4<\/h5>\n
1\u3001\u8fdb\u884c\u6709\u6548\u6027\u68c0\u67e5<\/p>\n
2\u3001\u8f6c\u6362\u6210\u7b49\u4ef7\u7684\u5bf9\u57fa\u672c\u8868\u7684\u67e5\u8be2<\/p>\n
3\u3001\u6267\u884c\u4fee\u6b63\u540e\u7684\u67e5\u8be2<\/p>\n
2\u3001\u4f8b\u5b50<\/h5>\n
\"image-20230901113939527\"<\/div><\/p>\n
2\u3001\u89c6\u56fe\u6d88\u89e3\u6cd5\u7684\u5c40\u9650<\/h4>\n
1\u3001\u6709\u4ee5\u4e0b\u60c5\u51b5\u89c6\u56fe\u5c0f\u7ed3\u6cd5\u4e0d\u80fd\u751f\u6210\u6b63\u786e\u67e5\u8be2 <\/p>\n
\"image-20230901114551488\"<\/div><\/p>\n
3.7.5\u3001\u66f4\u65b0\u89c6\u56fe<\/h3>\n
1\u3001\u8bf4\u660e<\/h4>\n
1\u3001\u662f\u6307\u901a\u8fc7\u89c6\u56fe\u6765\u63d2\u5165\u3001\u5220\u9664\u6570\u636e\uff0c\u56e0\u4e3a\u89c6\u56fe\u4e0d\u9002\u5408\u5b58\u50a8\u6570\u636e\uff0c\u6240\u4ee5\u66f4\u65b0\u64cd\u4f5c\u5c06\u901a\u8fc7\u89c6\u56fe\u6d88\u89e3\u6cd5\uff0c\u6765\u5bf9\u5b9e\u9645\u8868\u7684\u66f4\u65b0\u64cd\u4f5c<\/p>\n
2\u3001\u6ce8\u610f<\/h4>\n
1\u3001\u4e3a\u4e86\u9632\u6b62\u66f4\u65b0\u89c6\u56fe\u51fa\u9519\uff0c\u5b9a\u4e49\u89c6\u56fe\u7684\u65f6\u5019\u8981\u52a0WITH CHECK OPTION\u5b50\u53e5<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901115152047\"<\/div><\/p>\n
3\u3001\u4f8b\u5b50<\/p>\n
\"image-20230901115405048\"<\/div><\/p>\n
3\u3001\u66f4\u65b0\u89c6\u56fe\u7684\u9650\u5236<\/h4>\n
1\u3001\u4e00\u4e9b\u89c6\u56fe\u65e0\u6cd5\u66f4\u65b0\uff0c\u56e0\u4e3a\u89c6\u56fe\u66f4\u65b0\u4e0d\u80fd\u552f\u4e00\u5730\u6709\u610f\u4e49\u5730\u8f6c\u6362\u6210\u76f8\u5bf9\u5e94\u57fa\u672c\u8868\u7684\u66f4\u65b0<\/p>\n
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