{"id":251,"date":"2023-09-08T14:03:13","date_gmt":"2023-09-08T06:03:13","guid":{"rendered":"https:\/\/www.666818.xyz\/?p=251"},"modified":"2023-09-08T14:03:14","modified_gmt":"2023-09-08T06:03:14","slug":"mysql%e8%af%ad%e5%8f%a5%e5%87%bd%e6%95%b0%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.wkv.cc\/index.php\/2023\/09\/08\/mysql%e8%af%ad%e5%8f%a5%e5%87%bd%e6%95%b0%e6%80%bb%e7%bb%93\/","title":{"rendered":"Mysql\u8bed\u53e5&\u51fd\u6570\u603b\u7ed3"},"content":{"rendered":"\n

\u8bed\u53e5<\/h2>\n\n\n\n

1. SELECT\uff1a\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002<\/p>\n\n\n\n

2. INSERT\uff1a\u7528\u4e8e\u5411\u6570\u636e\u5e93\u4e2d\u63d2\u5165\u65b0\u8bb0\u5f55\u3002<\/p>\n\n\n\n

3. UPDATE\uff1a\u7528\u4e8e\u66f4\u65b0\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\u3002<\/p>\n\n\n\n

4. DELETE\uff1a\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u5220\u9664\u8bb0\u5f55\u3002<\/p>\n\n\n\n

5. CREATE\uff1a\u7528\u4e8e\u521b\u5efa\u65b0\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u7b49\u3002<\/p>\n\n\n\n

6. ALTER\uff1a\u7528\u4e8e\u4fee\u6539\u73b0\u6709\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u7b49\u3002<\/p>\n\n\n\n

7. DROP\uff1a\u7528\u4e8e\u5220\u9664\u73b0\u6709\u7684\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u5982\u8868\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u7b49\u3002<\/p>\n\n\n\n

8. TRUNCATE\uff1a\u7528\u4e8e\u6e05\u7a7a\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\u3002<\/p>\n\n\n\n

9. GRANT\uff1a\u7528\u4e8e\u6388\u4e88\u7528\u6237\u8bbf\u95ee\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u6743\u9650\u3002<\/p>\n\n\n\n

10. REVOKE\uff1a\u7528\u4e8e\u64a4\u9500\u7528\u6237\u8bbf\u95ee\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u6743\u9650\u3002<\/p>\n\n\n\n

11. COMMIT\uff1a\u7528\u4e8e\u63d0\u4ea4\u5f53\u524d\u4e8b\u52a1\u3002<\/p>\n\n\n\n

12. ROLLBACK\uff1a\u7528\u4e8e\u56de\u6eda\u5f53\u524d\u4e8b\u52a1\u3002<\/p>\n\n\n\n

13. SAVEPOINT\uff1a\u7528\u4e8e\u8bbe\u7f6e\u4e8b\u52a1\u56de\u6eda\u70b9\u3002<\/p>\n\n\n\n

14. SET\uff1a\u7528\u4e8e\u8bbe\u7f6e\u4f1a\u8bdd\u53d8\u91cf\u3002<\/p>\n\n\n\n

15. SHOW\uff1a\u7528\u4e8e\u663e\u793a\u6570\u636e\u5e93\u5bf9\u8c61\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n

16. DESCRIBE\uff1a\u7528\u4e8e\u663e\u793a\u8868\u7684\u7ed3\u6784\u3002<\/p>\n\n\n\n

17. EXPLAIN\uff1a\u7528\u4e8e\u663e\u793a\u67e5\u8be2\u6267\u884c\u8ba1\u5212\u3002<\/p>\n\n\n\n

18. USE\uff1a\u7528\u4e8e\u5207\u6362\u5f53\u524d\u6570\u636e\u5e93\u3002<\/p>\n\n\n\n

\u51fd\u6570<\/h2>\n\n\n\n

1. AVG()\uff1a\u7528\u4e8e\u8ba1\u7b97\u67d0\u5217\u7684\u5e73\u5747\u503c\u3002<\/p>\n\n\n\n

2. COUNT()\uff1a\u7528\u4e8e\u8ba1\u7b97\u67d0\u5217\u7684\u884c\u6570\u3002<\/p>\n\n\n\n

3. MAX()\uff1a\u7528\u4e8e\u8ba1\u7b97\u67d0\u5217\u7684\u6700\u5927\u503c\u3002<\/p>\n\n\n\n

4. MIN()\uff1a\u7528\u4e8e\u8ba1\u7b97\u67d0\u5217\u7684\u6700\u5c0f\u503c\u3002<\/p>\n\n\n\n

5. SUM()\uff1a\u7528\u4e8e\u8ba1\u7b97\u67d0\u5217\u7684\u603b\u548c\u3002<\/p>\n\n\n\n

6. UCASE()\uff1a\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/p>\n\n\n\n

7. LCASE()\uff1a\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5c0f\u5199\u3002<\/p>\n\n\n\n

8. MID()\uff1a\u7528\u4e8e\u4ece\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n

9. CONCAT()\uff1a\u7528\u4e8e\u5c06\u4e24\u4e2a\u6216\u591a\u4e2a\u5b57\u7b26\u4e32\u8fde\u63a5\u5728\u4e00\u8d77\u3002<\/p>\n\n\n\n

10.SUBSTRING()\uff1a\u7528\u4e8e\u4ece\u5b57\u7b26\u4e32\u4e2d\u63d0\u53d6\u5b50\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n

11.REPLACE()\uff1a\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u4e2d\u7684\u90e8\u5206\u5b57\u7b26\u66ff\u6362\u4e3a\u5176\u4ed6\u5b57\u7b26\u3002<\/p>\n\n\n\n

12.LEN()\uff1a\u7528\u4e8e\u8ba1\u7b97\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\u3002<\/p>\n\n\n\n

13.ROUND()\uff1a\u7528\u4e8e\u5c06\u6570\u5b57\u56db\u820d\u4e94\u5165\u5230\u6307\u5b9a\u7684\u5c0f\u6570\u4f4d\u6570\u3002<\/p>\n\n\n\n

14.NOW()\uff1a\u7528\u4e8e\u83b7\u53d6\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/p>\n\n\n\n

15.DATE()\uff1a\u7528\u4e8e\u4ece\u65e5\u671f\/\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u65e5\u671f\u90e8\u5206\u3002<\/p>\n\n\n\n

16.TIME()\uff1a\u7528\u4e8e\u4ece\u65e5\u671f\/\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u65f6\u95f4\u90e8\u5206\u3002<\/p>\n\n\n\n

17.YEAR()\uff1a\u7528\u4e8e\u4ece\u65e5\u671f\u503c\u4e2d\u63d0\u53d6\u5e74\u4efd\u90e8\u5206\u3002<\/p>\n\n\n\n

18.MONTH()\uff1a\u7528\u4e8e\u4ece\u65e5\u671f\u503c\u4e2d\u63d0\u53d6\u6708\u4efd\u90e8\u5206\u3002<\/p>\n\n\n\n

19.DAY()\uff1a\u7528\u4e8e\u4ece\u65e5\u671f\u503c\u4e2d\u63d0\u53d6\u65e5\u90e8\u5206\u3002<\/p>\n\n\n\n

20.HOUR()\uff1a\u7528\u4e8e\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u5c0f\u65f6\u90e8\u5206\u3002<\/p>\n\n\n\n

21.MINUTE()\uff1a\u7528\u4e8e\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u5206\u949f\u90e8\u5206\u3002<\/p>\n\n\n\n

22.SECOND()\uff1a\u7528\u4e8e\u4ece\u65f6\u95f4\u503c\u4e2d\u63d0\u53d6\u79d2\u90e8\u5206\u3002<\/p>\n\n\n\n

23.IF()\uff1a\u7528\u4e8e\u6267\u884c\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n\n\n\n

24.CASE…WHEN\uff1a\u7528\u4e8e\u6267\u884c\u591a\u91cd\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n\n\n\n

25.COALESCE()\uff1a\u7528\u4e8e\u8fd4\u56de\u7b2c\u4e00\u4e2a\u975e NULL \u503c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

\u8bed\u53e5 1. SELECT\uff1a\u7528\u4e8e\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002 2. INSERT\uff1a\u7528\u4e8e\u5411\u6570\u636e\u5e93\u4e2d\u63d2\u5165\u65b0\u8bb0\u5f55\u3002 3. UP […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[14],"class_list":["post-251","post","type-post","status-publish","format-standard","hentry","category-biancheng","tag-mysql"],"_links":{"self":[{"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/posts\/251","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/comments?post=251"}],"version-history":[{"count":1,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/posts\/251\/revisions"}],"predecessor-version":[{"id":252,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/posts\/251\/revisions\/252"}],"wp:attachment":[{"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/media?parent=251"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/categories?post=251"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wkv.cc\/index.php\/wp-json\/wp\/v2\/tags?post=251"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}