{"id":705,"date":"2015-05-29T11:21:50","date_gmt":"2015-05-29T03:21:50","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=705"},"modified":"2015-05-29T11:52:17","modified_gmt":"2015-05-29T03:52:17","slug":"sql-select-%e8%af%ad%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=705","title":{"rendered":"SQL\u8bed\u53e5\u57fa\u7840"},"content":{"rendered":"

SQL\u8bed\u53e5\u5b66\u4e60<\/a><\/p>\n

SQL:\u6570\u636e\u5e93\u67e5\u8be2\u8bed\u8a00\uff0c\u80fd\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u57fa\u672c\u64cd\u4f5c\uff0c\u5982\u521b\u5efa\u3001\u5220\u9664\u3001\u4fee\u6539\u6570\u636e\u5e93\u548c\u8868\uff0c\u5bf9\u8868\u8fdb\u884c\u66f4\u65b0\u64cd\u4f5c(\u589e\uff0c\u5220\uff0c\u6539\uff0c\u67e5);
\n
\n1.SQL SELECT \u8bed\u53e5<\/strong><\/span>:\u7528\u4e8e\u4ece\u8868\u4e2d\u9009\u53d6\u6570\u636e\u3002\u7ed3\u679c\u88ab\u5b58\u50a8\u5728\u4e00\u4e2a\u7ed3\u679c\u8868\u4e2d\uff08\u79f0\u4e3a\u7ed3\u679c\u96c6\uff09\u3002
\nSQL SELECT \u8bed\u6cd5:
\nSELECT \u5217\u540d1,\u5217\u540d2 FROM \u8868\u540d\u79f0
\n\u4ee5\u53ca\uff1a
\nSELECT * FROM \u8868\u540d\u79f0
\n\u6ce8\u91ca\uff1aSQL \u8bed\u53e5\u5bf9\u5927\u5c0f\u5199\u4e0d\u654f\u611f\u3002SELECT \u7b49\u6548\u4e8e select\u3002<\/p>\n

2.SQL SELECT DISTINCT \u8bed\u53e5<\/strong><\/span>
\n\u5728\u8868\u4e2d\uff0c\u53ef\u80fd\u4f1a\u5305\u542b\u91cd\u590d\u503c\u3002\u8fd9\u5e76\u4e0d\u6210\u95ee\u9898\uff0c\u4e0d\u8fc7\uff0c\u6709\u65f6\u60a8\u4e5f\u8bb8\u5e0c\u671b\u4ec5\u4ec5\u5217\u51fa\u4e0d\u540c\uff08distinct\uff09\u7684\u503c\u3002
\n\u5173\u952e\u8bcd DISTINCT \u7528\u4e8e\u8fd4\u56de\u552f\u4e00\u4e0d\u540c\u7684\u503c\u3002
\n\u8bed\u6cd5\uff1a
\nSELECT DISTINCT \u5217\u540d\u79f0 FROM \u8868\u540d\u79f0<\/p>\n

3.WHERE \u5b50\u53e5<\/strong><\/span>
\n\u5982\u9700\u6709\u6761\u4ef6\u5730\u4ece\u8868\u4e2d\u9009\u53d6\u6570\u636e\uff0c\u53ef\u5c06WHERE \u5b50\u53e5\u6dfb\u52a0\u5230 SELECT \u8bed\u53e5\u3002
\n\u8bed\u6cd5:
\nSELECT \u5217\u540d\u79f0 FROM \u8868\u540d\u79f0 WHERE \u5217\u8fd0\u7b97\u7b26 \u503c
\n\u4e0b\u9762\u7684\u8fd0\u7b97\u7b26\u53ef\u5728WHERE \u5b50\u53e5\u4e2d\u4f7f\u7528\uff1a
\n\u64cd\u4f5c\u7b26 \u63cf\u8ff0<\/strong>
\n= \u00a0 \u00a0:\u7b49\u4e8e<\/span>
\n <> :\u4e0d\u7b49\u4e8e<\/span>
\n > \u00a0 :\u5927\u4e8e<\/span>
\n < \u00a0 \u00a0“\u5c0f\u4e8e <\/span>
\n>=: \u5927\u4e8e\u7b49\u4e8e<\/span>
\n <= :\u5c0f\u4e8e\u7b49\u4e8e<\/span>
\n BETWEEN \u00a0:\u5728\u67d0\u4e2a\u8303\u56f4\u5185<\/span>
\n LIKE \u00a0 :\u641c\u7d22\u67d0\u79cd\u6a21\u5f0f<\/span>
\n\u6ce8\u91ca\uff1a\u5728\u67d0\u4e9b\u7248\u672c\u7684SQL \u4e2d\uff0c\u64cd\u4f5c\u7b26 <>\u53ef\u4ee5\u5199\u4e3a !=\u3002<\/p>\n

4.AND \u548c OR \u8fd0\u7b97\u7b26\u7528\u4e8e\u57fa\u4e8e\u4e00\u4e2a\u4ee5\u4e0a\u7684\u6761\u4ef6\u5bf9\u8bb0\u5f55\u8fdb\u884c\u8fc7\u6ee4\u3002<\/strong><\/span>
\nAND \u548c OR \u8fd0\u7b97\u7b26<\/p>\n

AND \u548c OR \u53ef\u5728 WHERE \u5b50\u8bed\u53e5\u4e2d\u628a\u4e24\u4e2a\u6216\u591a\u4e2a\u6761\u4ef6\u7ed3\u5408\u8d77\u6765\u3002
\n\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u548c\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u90fd\u6210\u7acb\uff0c\u5219 AND \u8fd0\u7b97\u7b26\u663e\u793a\u4e00\u6761\u8bb0\u5f55\u3002
\n\u5982\u679c\u7b2c\u4e00\u4e2a\u6761\u4ef6\u548c\u7b2c\u4e8c\u4e2a\u6761\u4ef6\u4e2d\u53ea\u8981\u6709\u4e00\u4e2a\u6210\u7acb\uff0c\u5219 OR \u8fd0\u7b97\u7b26\u663e\u793a\u4e00\u6761\u8bb0\u5f55\u3002
\nSELECT * FROM Persons WHERE FirstName=’Thomas’ AND LastName=’Carter’
\nSELECT * FROM Persons WHERE firstname=’Thomas’ OR lastname=’Carter’
\nSELECT * FROM Persons WHERE (FirstName=’Thomas’ OR FirstName=’William’) AND LastName=’Carter’<\/p>\n

5.ORDER BY \u8bed\u53e5<\/strong><\/span>
\nORDER BY \u8bed\u53e5\u7528\u4e8e\u6839\u636e\u6307\u5b9a\u7684\u5217\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u6392\u5e8f\u3002
\nORDER BY \u8bed\u53e5\u9ed8\u8ba4\u6309\u7167\u5347\u5e8f\u5bf9\u8bb0\u5f55\u8fdb\u884c\u6392\u5e8f\u3002
\n\u5982\u679c\u60a8\u5e0c\u671b\u6309\u7167\u964d\u5e8f\u5bf9\u8bb0\u5f55\u8fdb\u884c\u6392\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528 DESC \u5173\u952e\u5b57\u3002\u5347\u5e8f\u4f7f\u7528\u5173\u952e\u5b57ASC.
\nSELECT Company, OrderNumber FROM Orders ORDER BY Company DESC, OrderNumber ASC<\/p>\n

6.INSERT INTO \u8bed\u53e5<\/strong><\/span>
\nINSERT INTO \u8bed\u53e5\u7528\u4e8e\u5411\u8868\u683c\u4e2d\u63d2\u5165\u65b0\u7684\u884c\u3002
\n\u8bed\u6cd5
\nINSERT INTO \u8868\u540d\u79f0 VALUES (\u503c1, \u503c2,….)
\n\u6211\u4eec\u4e5f\u53ef\u4ee5\u6307\u5b9a\u6240\u8981\u63d2\u5165\u6570\u636e\u7684\u5217\uff1a
\nINSERT INTO table_name (\u52171, \u52172,…) VALUES (\u503c1, \u503c2,….)
\nINSERT INTO Persons VALUES (‘Gates’, ‘Bill’, ‘Xuanwumen 10’, ‘Beijing’)
\nINSERT INTO Persons (LastName, Address) VALUES (‘Wilson’, ‘Champs-Elysees’)<\/p>\n

7.Update \u8bed\u53e5<\/strong><\/span>
\nUpdate \u8bed\u53e5\u7528\u4e8e\u4fee\u6539\u8868\u4e2d\u7684\u6570\u636e\u3002
\n\u8bed\u6cd5\uff1a
\nUPDATE \u8868\u540d\u79f0 SET \u5217\u540d\u79f0 = \u65b0\u503c WHERE \u5217\u540d\u79f0 = \u67d0\u503c
\nUPDATE Person SET FirstName = ‘Fred’ WHERE LastName = ‘Wilson’
\nUPDATE Person SET Address = ‘Zhongshan 23’, City = ‘Nanjing’ WHERE LastName = ‘Wilson’<\/p>\n

8.DELETE \u8bed\u53e5<\/strong><\/span>
\nDELETE \u8bed\u53e5\u7528\u4e8e\u5220\u9664\u8868\u4e2d\u7684\u884c\u3002
\n\u8bed\u6cd5
\nDELETE FROM \u8868\u540d\u79f0 WHERE \u5217\u540d\u79f0 = \u503c
\nDELETE FROM Person WHERE LastName = ‘Wilson’
\n\u5220\u9664\u6240\u6709\u884c:
\nDELETE FROM table_name<\/p>\n

9.BETWEEN \u64cd\u4f5c\u7b26<\/strong><\/span><\/p>\n

\u64cd\u4f5c\u7b26 BETWEEN … AND \u4f1a\u9009\u53d6\u4ecb\u4e8e\u4e24\u4e2a\u503c\u4e4b\u95f4\u7684\u6570\u636e\u8303\u56f4\u3002\u8fd9\u4e9b\u503c\u53ef\u4ee5\u662f\u6570\u503c\u3001\u6587\u672c\u6216\u8005\u65e5\u671f\u3002
\nSQL BETWEEN \u8bed\u6cd5:
\nSELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2
\n\u5982\u9700\u4ee5\u5b57\u6bcd\u987a\u5e8f\u663e\u793a\u4ecb\u4e8e”Adams”\uff08\u5305\u62ec\uff09\u548c”Carter”\uff08\u4e0d\u5305\u62ec\uff09\u4e4b\u95f4\u7684\u4eba\uff0c\u8bf7\u4f7f\u7528\u4e0b\u9762\u7684SQL\uff1a
\nSELECT * FROM Persons WHERE LastName BETWEEN ‘Adams’ AND ‘Carter’
\n\u5982\u9700\u4f7f\u7528\u4e0a\u9762\u7684\u4f8b\u5b50\u663e\u793a\u8303\u56f4\u4e4b\u5916\u7684\u4eba\uff0c\u8bf7\u4f7f\u7528NOT \u64cd\u4f5c\u7b26\uff1a
\nSELECT * FROM Persons WHERE LastName NOT BETWEEN ‘Adams’ AND ‘Carter’<\/p>\n

10.LIKE \u64cd\u4f5c\u7b26<\/strong><\/span><\/p>\n

LIKE \u64cd\u4f5c\u7b26\u7528\u4e8e\u5728 WHERE \u5b50\u53e5\u4e2d\u641c\u7d22\u5217\u4e2d\u7684\u6307\u5b9a\u6a21\u5f0f\u3002
\nSQL LIKE \u64cd\u4f5c\u7b26\u8bed\u6cd5
\nSELECT column_name(s) FROM table_name WHERE column_name LIKE pattern
\n\u73b0\u5728\uff0c\u6211\u4eec\u5e0c\u671b\u4ece\u4e0a\u9762\u7684”Persons” \u8868\u4e2d\u9009\u53d6\u5c45\u4f4f\u5728\u4ee5”N” \u5f00\u59cb\u7684\u57ce\u5e02\u91cc\u7684\u4eba\uff1a
\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684SELECT \u8bed\u53e5\uff1a
\nSELECT * FROM Persons WHERE City LIKE ‘N%’<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5e0c\u671b\u4ece”Persons” \u8868\u4e2d\u9009\u53d6\u5c45\u4f4f\u5728\u4ee5”g” \u7ed3\u5c3e\u7684\u57ce\u5e02\u91cc\u7684\u4eba\uff1a
\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684SELECT \u8bed\u53e5\uff1a
\nSELECT * FROM Persons WHERE City LIKE ‘%g’<\/p>\n

\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5e0c\u671b\u4ece”Persons” \u8868\u4e2d\u9009\u53d6\u5c45\u4f4f\u5728\u5305\u542b”lon” \u7684\u57ce\u5e02\u91cc\u7684\u4eba\uff1a
\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684SELECT \u8bed\u53e5\uff1a
\nSELECT * FROM Persons WHERE City LIKE ‘%lon%’<\/p>\n

\u901a\u8fc7\u4f7f\u7528NOT \u5173\u952e\u5b57\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece”Persons” \u8868\u4e2d\u9009\u53d6\u5c45\u4f4f\u5728\u4e0d\u5305\u542b”lon” \u7684\u57ce\u5e02\u91cc\u7684\u4eba\uff1a
\n\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684SELECT \u8bed\u53e5\uff1a
\nSELECT * FROM Persons WHERE City NOT LIKE ‘%lon%’<\/p>\n","protected":false},"excerpt":{"rendered":"

SQL\u8bed\u53e5\u5b66\u4e60 SQL:\u6570\u636e\u5e93\u67e5\u8be2\u8bed\u8a00\uff0c\u80fd\u5b9e\u73b0\u5bf9\u6570\u636e\u5e93\u7684\u57fa\u672c\u64cd\u4f5c\uff0c\u5982\u521b\u5efa\u3001\u5220\u9664\u3001\u4fee\u6539\u6570\u636e\u5e93\u548c\u8868\uff0c\u5bf9\u8868\u8fdb\u884c\u66f4\u65b0\u64cd […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[61],"tags":[62],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/705"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=705"}],"version-history":[{"count":12,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/705\/revisions"}],"predecessor-version":[{"id":725,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/705\/revisions\/725"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=705"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=705"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=705"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}