MYSQL_HOME\uff1aC:\\Program Files\\MySQL\\MySQL Server 5.7<\/p>\n
\u200b PATH:%MYSQL_HOME%\\bin;<\/p>\n
\u542f\u52a8mysql\u670d\u52a1<\/p>\n
\u6253\u5f00cmd\uff0c\u8f93\u5165net start mysql57.\u505c\u6b62\u670d\u52a1 net stop mysql57<\/p>\n
\u9a8c\u8bc1\u662f\u5426\u5b89\u88c5\u6210\u529f\u6216\u8005\u767b\u9646mysql\uff1a
\n-u root -p \u56de\u8f66\u8f93\u5165\u5bc6\u7801\u5373\u53ef<\/p>\n
\u5378\u8f7dMySQL<\/span><\/strong><\/p>\n 1.\u505c\u6b62\u670d\u52a1\uff0c\u4f7f\u7528net stop mysql \u547d\u4ee4\u505c\u6b62\u670d\u52a1<\/p>\n 2.\u5728\u63a7\u5236\u9762\u677f\u2013>\u201d\u7a0b\u5e8f\u548c\u529f\u80fd\u201d\u4e2d\uff0c\u627e\u5230\u201cmysql\u7a0b\u5e8f\u201d\uff0c\u70b9\u51fb\u5378\u8f7d\u3002<\/p>\n 3.\u5220\u9664\u5b89\u88c5\u76ee\u5f55,\u4e00\u822c\u9ed8\u8ba4\u5728C:\\Program Files\\MySQL\u3002<\/p>\n 4.\u5220\u9664\u6570\u636e\u5e93\u6587\u4ef6\u5b58\u653e\u76ee\u5f55\uff0c\u4e00\u822c\u9ed8\u8ba4\u5728C:\\ProgramData\\MySQL\u3002<\/p>\n MySQL\u5b89\u88c5\u76ee\u5f55<\/span><\/strong><\/p>\n bin\u6587\u4ef6\u5939\uff1a\u8be5\u6587\u4ef6\u5939\u4e0b\u5b58\u653e\u7740\u53ef\u6267\u884c\u6587\u4ef6 SQL\u8bed\u53e5\u5206\u7c7b<\/span><\/strong> MySQL\u7684\u4f7f\u7528\u6ce8\u610f<\/span><\/strong>\uff1a<\/p>\n sql\u8bed\u53e5\u4ee5 ; \u7ed3\u5c3e\u3002<\/p>\n MySQL\u6ce8\u91ca\uff1a\uff081\uff09#\u5f00\u5934 \uff082\uff09\u2013\u7a7a\u683c \u5f00\u5934 \uff083\uff09\/* \u591a\u884c\u6ce8\u91ca *\/ \u521b\u5efa\u6570\u636e\u5e93<\/strong><\/span>\uff1a \u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d\u7684\u6240\u6709\u6570\u636e\u5e93<\/span>SQL> SHOW DATABASES;<\/p>\n \u67e5\u770b\u524d\u9762\u521b\u5efa\u7684mydb2\u6570\u636e\u5e93\u7684\u5b9a\u4e49\u4fe1\u606f<\/span>SQL> ShOW CREATE DATABASE mydb2;<\/p>\n \u5b57\u7b26\u96c6\u4fee\u6539\u4e3autf8; \u5220\u5e93\uff1aDROP DATABASE IF EXISTS mydb3;<\/p>\n \u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93<\/span>\uff1aSelect database();<\/p>\n \u5207\u6362\u6570\u636e\u5e93\uff1aUSE mydb2;<\/p>\n \u9000\u51faMySQL\uff1aquit;\u6216exit;<\/p>\n \u5e38\u7528\u6570\u636e\u7c7b\u578b<\/strong><\/span>\uff1a<\/span><\/p>\n int\uff1a\u6574\u578b\uff084\u4e2a\u5b57\u8282\uff09<\/p>\n double\uff1a\u6d6e\u70b9\u578b\uff088\u4e2a\u5b57\u8282\uff09\uff0c\u8fd1\u4f3c\u503c<\/p>\n \u4f8b\u5982double(5,2)\u8868\u793a\u6700\u591a5\u4f4d\uff0c\u5176\u4e2d\u5fc5\u987b\u67092\u4f4d\u5c0f\u6570\uff0c\u5373\u6700\u5927\u503c\u4e3a999.99<\/p>\n decimal\uff1a\u7cbe\u786e\u6570\u503c\u6570\u636e\uff0c\u6700\u5927\u4f4d\u6570\u53ef\u4ee5\u662f65<\/p>\n \u4f8b\u5982decimal(5,2)\u80fd\u591f\u5b58\u50a8\u5177\u6709\u4e94\u4f4d\u6570\u548c\u4e24\u4f4d\u5c0f\u6570\u7684\u4efb\u4f55\u503c\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b58\u50a8\u8303\u56f4\u4e3a<\/p>\n -999.99\u81f3999.99\u3002<\/p>\n char\uff1a\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b char(10) \u2018aaa \u2018 \u56fa\u5b9a10\u4e2a\u5b57\u7b26\uff0c\u4e0d\u8db3\u8865\u7a7a\u683c\uff0c \u957f\u5ea60-255<\/p>\n \u7f3a\u70b9\uff1a\u6d6a\u8d39\u7a7a\u95f4\uff0c\u4f18\u70b9:\u67e5\u8be2\u901f\u5ea6\u5feb<\/p>\n varchar\uff1a\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b varchar(10) \u2018aaa\u2019 \u6700\u591a\u5b58\u50a810\u4e2a\u5b57\u7b26<\/p>\n \u7f3a\u70b9\uff1a\u67e5\u8be2\u901f\u5ea6\u6162\uff0c\u4f18\u70b9\uff1a\u8282\u7701\u7a7a\u95f4<\/p>\n text\uff1a\u5927\u6587\u672c\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b\u6709\u5b57\u7b26\u7f16\u7801\uff0c\u5b58\u50a8\u6bd4\u8f83\u5927\u7684\u6587\u672c\u6570\u636e\u3002<\/p>\n blob\uff1aBinary Large Object\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61\u6570\u636e\uff1b\u53ef\u4ee5\u5b58\u50a8\u56fe\u7247\u3001\u97f3\u9891\u3001\u89c6\u9891<\/p>\n date\uff1a\u65e5\u671f\u7c7b\u578b\uff0c\u683c\u5f0f\u4e3a\uff1ayyyy-MM-dd\uff1b<\/p>\n time\uff1a\u65f6\u95f4\u7c7b\u578b\uff0c\u683c\u5f0f\u4e3a\uff1ahh:mm:ss<\/p>\n timestamp\uff1a\u65f6\u95f4\u6233\u7c7b\u578b yyyy-MM-dd hh:mm:ss \u4f1a\u81ea\u52a8\u8d4b\u503c<\/p>\n datetime:\u65e5\u671f\u65f6\u95f4\u7c7b\u578b yyyy-MM-dd hh:mm:ss<\/p>\n \u5e38\u7528\u7ea6\u675f<\/strong>\uff1a<\/span><\/p>\n \u4e3b\u952e\u7ea6\u675f\uff1aprimary key (\u4fdd\u8bc1\u6570\u636e\u552f\u4e00\u6027),\u4e0d\u80fd\u91cd\u590d\uff0c\u4e0d\u80fd\u4e3anull<\/p>\n \u552f\u4e00\u7ea6\u675f\uff1aunique [key],\u4e0d\u80fd\u91cd\u590d\uff0c\u53ef\u4ee5\u4e3anull<\/p>\n \u975e\u7a7a\u7ea6\u675f\uff1anot null<\/p>\n \u9ed8\u8ba4\u7ea6\u675f\uff1adefault<\/p>\n \u5916\u952e\u7ea6\u675f\uff1aforeign key<\/p>\n \u81ea\u52a8\u589e\u957f\uff1aauto_increment<\/p>\n \u521b\u5efa\u65b0\u8868<\/span>\uff1a \u67e5\u770b\u8868\uff1aSELECT*FROM users<\/p>\n DROP TABLE\u8bed\u53e5\u7528\u4e8e\u5220\u9664\u73b0\u6709\u8868\u3002<\/span><\/strong> \u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684\u6240\u6709\u8868<\/span>\uff1aSHOW TABLES;<\/p>\n \u67e5\u770b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f<\/span>\uff1aDESC student;<\/p>\n \u589e\u52a0\u5217\u540daddr<\/span>\uff1aALTER TABLE users ADD addr VARCHAR(50) NOT NULL<\/p>\n \u4fee\u6539addr\u957f\u5ea6\u4e3a30<\/span>\uff1aALTER TABLE users MODIFY addr VARCHAR(30) NOT NULL<\/p>\n \u5220\u9664addr\u5217\u540d<\/span>\uff1aALTER TABLE users DROP addr<\/p>\n \u67e5\u770b\u8868\u7684\u7ec6\u8282<\/span>\uff1aSHOW CREATE TABLE users;<\/p>\n \u4fee\u6539\u8868\u7684\u5b57\u7b26\u96c6\u4e3agbk<\/span>\uff1aALTER TABLE user CHARACTER SET gbk;<\/p>\n \u5217\u540dusername\u4fee\u6539\u4e3ausernames<\/span>\uff1aALTER TABLE users CHANGE username usernames VARCHAR(50) NOT NULL<\/p>\n \u8868\u7684\u63d2\u5165\u6570\u636e<\/span>\uff1a \u63d2\u5165\u6ce8\u610f\u4e8b\u9879<\/span>\uff1a \u4fee\u6539\u6570\u636e<\/span>\uff1a \u5220\u9664\u6570\u636e<\/span>\uff1a \u5220\u9664\u8868\u4e2d\u6240\u6709\u6570\u636e<\/span>\uff1adelete from users \u6216 TRUNCATE TABLE users<\/p>\n delete\u548ctruncate\u533a\u522b<\/span>\uff1a<\/p>\n DELETE \u5220\u9664\u8868\u4e2d\u7684\u6570\u636e\uff0c\u8868\u7ed3\u6784\u8fd8\u5728;\u5220\u9664\u540e\u7684\u6570\u636e\u4f7f\u7528\u65e5\u5fd7\u53ef\u4ee5\u627e\u56de\u3002<\/p>\n TRUNCATE \u5220\u9664\u662f\u628a\u8868\u76f4\u63a5DROP\u6389\uff0c\u7136\u540e\u518d\u521b\u5efa\u4e00\u4e2a\u540c\u6837\u7684\u65b0\u8868\u3002<\/p>\n TRUNCATE \u5220\u9664\u7684\u6570\u636e\u4e0d\u80fd\u627e\u56de\u3002\u6267\u884c\u901f\u5ea6\u6bd4DELETE\u5feb\u3002<\/p>\n \u6570\u636e\u5e93\u5de5\u5177\uff1aNavicat\u3001sqlyog<\/p>\n \u67e5\u8be2<\/span> \u67e5\u8be2\u6240\u6709\u6570\u636e<\/span>\uff1aselect*from users<\/p>\n \u67e5\u8be2\u6307\u5b9a\u5217<\/span>\uff1aSELECT usernames FROM users<\/p>\n \u6761\u4ef6\u67e5\u8be2<\/span>\uff1aSELECT mobile FROM users WHERE mobile=’138′<\/p>\n \u8fd0\u7b97\u7b26<\/strong><\/span><\/p>\n \u6bd4\u8f83\u8fd0\u7b97\u7b26<\/span><\/p>\n l =\u3001!=\u3001<>\u3001<\u3001<=\u3001>\u3001>=\uff1b<\/p>\n BETWEEN\u2026AND\uff1b IN(set)\uff1b IS NULL\uff1b<\/p>\n \u67e5\u8be2\u5e74\u9f84\u4e3anull\u7684\u8bb0\u5f55<\/span>\uff1aSELECT * FROM stu WHERE age IS NULL;<\/p>\n \u5173\u7cfb\u8fd0\u7b97\u7b26<\/span><\/p>\n AND\uff1b &&<\/p>\n \u67e5\u8be2\u5e74\u9f84\u572820\u523040\u4e4b\u95f4\u7684\u5b66\u751f\u8bb0\u5f55<\/span>\uff1a<\/p>\n SELECT *FROM stu WHERE age>=20 AND age<=40;<\/p>\n OR\uff1b ||<\/p>\n \u67e5\u8be2\u5b66\u53f7\u4e3aS_1001\uff0c\u6216\u8005\u59d3\u540d\u4e3aliSi\u7684\u8bb0\u5f55<\/span>\uff1a<\/p>\n SELECT * FROM stu WHERE sid =\u2019S_1001\u2032 OR sname=\u2019liSi\u2019;<\/p>\n NOT\uff1b ! \u7b97\u672f\u8fd0\u7b97\u7b26:<\/span>+ \u2013 * \/ %<\/p>\n \u6a21\u7cca\u67e5\u8be2<\/strong><\/span><\/p>\n \u5f53\u60f3\u67e5\u8be2\u59d3\u540d\u4e2d\u5305\u542ba\u5b57\u6bcd\u7684\u5b66\u751f\u65f6\u5c31\u9700\u8981\u4f7f\u7528\u6a21\u7cca\u67e5\u8be2\u4e86\u3002\u6a21\u7cca\u67e5\u8be2\u9700\u8981\u4f7f\u7528\u5173\u952e\u5b57LIKE\u3002<\/p>\n \u901a\u914d\u7b26:<\/p>\n _ \u4efb\u610f\u4e00\u4e2a\u5b57\u7b26<\/p>\n %\uff1a\u4efb\u610f0~n\u4e2a\u5b57\u7b26<\/p>\n \u2018\u5f20%\u2019 \u2014\u300b\u5f20\u4e09\u4e30 \u5f20\u4e09 \u5f20\u65e0\u5fcc<\/p>\n \u2018\u674e_\u2019 \u2014>\u674e\u56db \u674e\u9035 \u674e\u521a<\/p>\n SELECT *FROM users WHERE usernames LIKE ‘_____’#\u5339\u914d\u5230admin \u5b57\u6bb5\u63a7\u5236\u67e5\u8be2<\/strong><\/span><\/p>\n \u53bb\u9664\u91cd\u590d\u8bb0\u5f55 DISTINCT\u00a0<\/span> \u6c42\u548c<\/span>\uff1aSELECT*,money+salary FROM users#\u8ba1\u7b97\u91d1\u94b1\u548c\u5de5\u8d44\u4e4b\u548c<\/p>\n \u5408\u5e76\u67e5\u8be2<\/span>\uff1a\u6ce8\u610f\u5b57\u7b26\u4e32\u7684\u5408\u5e76\u4e0d\u80fd\u4f7f\u7528+ \uff0cAS\u53ef\u4ee5\u7701\u7565 \u6392\u5e8f\uff1aASC\u5347\u5e8f\uff0cDESC\u964d\u5e8f<\/span><\/p>\n SELECT * FROM users ORDER BY age ASC#\u5347\u5e8f \u805a\u5408\u51fd\u6570<\/strong><\/span><\/p>\n \u805a\u5408\u51fd\u6570\u662f\u7528\u6765\u505a\u7eb5\u5411\u8fd0\u7b97\u7684\u51fd\u6570\uff1a<\/p>\n COUNT()\uff1a\u7edf\u8ba1\u6307\u5b9a\u5217\u4e0d\u4e3aNULL\u7684\u8bb0\u5f55\u884c\u6570\uff1b<\/p>\n MAX()\uff1a\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6700\u5927\u503c\uff0c\u5982\u679c\u6307\u5b9a\u5217\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u90a3\u4e48\u4f7f\u7528\u5b57\u7b26\u4e32\u6392\u5e8f\u8fd0\u7b97\uff1b<\/p>\n MIN()\uff1a\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6700\u5c0f\u503c\uff0c\u5982\u679c\u6307\u5b9a\u5217\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u90a3\u4e48\u4f7f\u7528\u5b57\u7b26\u4e32\u6392\u5e8f\u8fd0\u7b97\uff1b<\/p>\n SUM()\uff1a\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u6570\u503c\u548c\uff0c\u5982\u679c\u6307\u5b9a\u5217\u7c7b\u578b\u4e0d\u662f\u6570\u503c\u7c7b\u578b\uff0c\u90a3\u4e48\u8ba1\u7b97\u7ed3\u679c\u4e3a0\uff1b<\/p>\n AVG()\uff1a\u8ba1\u7b97\u6307\u5b9a\u5217\u7684\u5e73\u5747\u503c\uff0c\u5982\u679c\u6307\u5b9a\u5217\u7c7b\u578b\u4e0d\u662f\u6570\u503c\u7c7b\u578b\uff0c\u90a3\u4e48\u8ba1\u7b97\u7ed3\u679c\u4e3a0\uff1b<\/p>\n count<\/span><\/strong>\uff1a \u67e5\u8be2users\u8868\u4e2d\u8bb0\u5f55\u6570<\/span>\uff1a<\/p>\n SELECT COUNT(*) AS \u2018\u522b\u540d\u2019 FROM users;#\u8fd4\u56de\u6570\u636e\u7684\u6570\u91cf<\/p>\n \u67e5\u8be2users\u8868\u4e2d\u91d1\u94b1\u5927\u4e8e5000\u7684\u4eba\u6570<\/span>\uff1a SUM\u548cAVG<\/span><\/strong><\/p>\n \u67e5\u8be2\u6240\u6709\u96c7\u5458\u6708\u85aa\u548c<\/span>\uff1aSELECT SUM(money) FROM users;<\/p>\n \u67e5\u8be2\u6240\u6709\u96c7\u5458\u6708\u85aa\u548c\uff0c\u4ee5\u53ca\u6240\u6709\u96c7\u5458\u4f63\u91d1\u548c<\/span>:SELECT SUM(money), SUM(salary) FROM users<\/p>\n \u67e5\u8be2\u6240\u6709\u96c7\u5458\u6708\u85aa+\u4f63\u91d1\u548c\uff1a\u5982\u679c\u6ca1\u6709\u503c\uff0c\u7528 0 \u8865<\/span> \u7edf\u8ba1\u6240\u6709\u5458\u5de5\u5e73\u5747\u5de5\u8d44<\/span>\uff1aSELECT AVG(salary) FROM users;<\/p>\n MAX\u548cMIN<\/strong><\/span><\/p>\n \u67e5\u8be2\u6700\u9ad8\u5de5\u8d44\u548c\u6700\u4f4e\u5de5\u8d44\uff1aSELECT MAX(money), MIN(money) FROM users;<\/p>\n \u5206\u7ec4\u67e5\u8be2 \u5f53\u9700\u8981\u5206\u7ec4\u67e5\u8be2\u65f6\u9700\u8981\u4f7f\u7528GROUP BY\u5b50\u53e5\uff0c\u4f8b\u5982\u67e5\u8be2\u6bcf\u4e2a\u90e8\u95e8\u7684\u5de5\u8d44\u548c\uff0c\u8fd9\u8bf4\u660e\u8981\u4f7f\u7528\u90e8\u5206\u6765\u5206\u7ec4\u3002<\/p>\n \u6ce8\uff1a\u51e1\u662f\u548c\u805a\u5408\u51fd\u6570\u540c\u65f6\u51fa\u73b0\u7684\u5217\u540d\uff0c\u5219\u4e00\u5b9a\u8981\u5199\u5728group by \u4e4b\u540e<\/span><\/p>\n \u67e5\u8be2\u6bcf\u4e2a\u4eba\u7684\u91d1\u94b1\u548c\u6bcf\u4e2a\u90e8\u95e8\u7684\u5de5\u8d44\u548c<\/span>\uff1a<\/p>\n SELECT money, SUM(salary)FROM users GROUP BY money;<\/p>\n \u67e5\u8be2\u6bcf\u4e2a\u4eba\u7684\u91d1\u94b1\u4ee5\u53ca\u4eba\u6570<\/span>\uff1a<\/p>\n SELECT money,COUNT(*) FROM users GROUP BY money<\/p>\n \u67e5\u8be2\u6bcf\u4e2a\u4eba\u7684\u5de5\u8d44\u4ee5\u53ca\u6bcf\u4e2a\u4eba\u5de5\u8d44\u5927\u4e8e1500\u7684\u4eba\u6570\uff1a<\/span><\/p>\n SELECT salary,COUNT(*)FROM users WHERE salary>5000 GROUP BY salary<\/p>\n HAVING\u5b50\u53e5<\/strong><\/span><\/p>\n \u67e5\u8be2\u5de5\u8d44\u603b\u548c\u5927\u4e8e9000\u7684\u90e8\u95e8\u7f16\u53f7\u4ee5\u53ca\u5de5\u8d44\u548c\uff1a<\/p>\n SELECT salary,SUM(salary) FROM users GROUP BY salary HAVING SUM(salary)>6000<\/p>\n \u6ce8\uff1ahaving\u4e0ewhere\u7684\u533a\u522b:<\/span><\/strong><\/p>\n 1.having\u662f\u5728\u5206\u7ec4\u540e\u5bf9\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4,where\u662f\u5728\u5206\u7ec4\u524d\u5bf9\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4<\/span><\/p>\n 2.having\u540e\u9762\u53ef\u4ee5\u4f7f\u7528\u5206\u7ec4\u51fd\u6570(\u7edf\u8ba1\u51fd\u6570)<\/span><\/p>\n where\u540e\u9762\u4e0d\u53ef\u4ee5\u4f7f\u7528\u5206\u7ec4\u51fd\u6570\u3002<\/span><\/strong><\/p>\n where\u662f\u5bf9\u5206\u7ec4\u524d\u8bb0\u5f55\u7684\u6761\u4ef6\uff0c\u5982\u679c\u67d0\u884c\u8bb0\u5f55\u6ca1\u6709\u6ee1\u8db3WHERE\u5b50\u53e5\u7684\u6761\u4ef6\uff0c\u90a3\u4e48\u8fd9\u884c\u8bb0\u5f55\u4e0d\u4f1a\u53c2\u52a0\u5206\u7ec4\uff1b\u800c having\u662f\u5bf9\u5206\u7ec4\u540e\u6570\u636e\u7684\u7ea6\u675f\u3002<\/span><\/p>\n LIMIT\u9650\u5236<\/strong><\/span><\/p>\n LIMIT\u7528\u6765\u9650\u5b9a\u67e5\u8be2\u7ed3\u679c\u7684\u8d77\u59cb\u884c\uff0c\u4ee5\u53ca\u603b\u884c\u6570\u3002\u8d77\u59cb\u884c\u4ece0\u5f00\u59cb<\/span> \u67e5\u8be2\u524d3\u884c\u8bb0\u5f55\uff0c\u8d77\u59cb\u884c\u4ece0\u5f00\u59cb\uff1a<\/span>SELECT*FROM users LIMIT 0,3<\/p>\n","protected":false},"excerpt":{"rendered":" 2020Javaweb\u6559\u7a0b\u4e4bmysql\u4f7f\u7528 mysql\u73af\u5883\u53d8\u91cf MYSQL_HOME\uff1aC:\\Program F […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2351","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2351"}],"version-history":[{"count":1,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2351\/revisions"}],"predecessor-version":[{"id":2352,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2351\/revisions\/2352"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2351"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2351"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\ninclude\u6587\u4ef6\u5939\uff1a\u8be5\u6587\u4ef6\u5939\u4e0b\u5b58\u653e\u7740\u5934\u6587\u4ef6
\nlib\u6587\u4ef6\u5939\uff1a\u8be5\u6587\u4ef6\u5939\u4e0b\u5b58\u653e\u7740\u5e93\u6587\u4ef6
\nshare\u6587\u4ef6\u5939\uff1a\u8be5\u6587\u4ef6\u5939\u4e0b\u5b58\u653e\u7740\u5b57\u7b26\u96c6\u3001\u8bed\u8a00\u7b49\u4fe1\u606f\u3002<\/p>\n
\nDDL\uff08Data Definition Language\uff09\uff1a\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff0c\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u5bf9\u8c61\uff1a\u5e93\u3001\u8868\u3001\u5217\u7b49\u3002
\nDML\uff08Data Manipulation Language\uff09\uff1a\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff0c\u7528\u6765\u5b9a\u4e49\u6570\u636e\u5e93\u8bb0\u5f55\uff08\u6570\u636e\uff09\u3002
\nDCL\uff08Data Control Language\uff09\uff1a\u6570\u636e\u63a7\u5236\u8bed\u8a00\uff0c\u7528\u6765\u5b9a\u4e49\u8bbf\u95ee\u6743\u9650\u548c\u5b89\u5168\u7ea7\u522b\u3002
\nDQL\uff08Data Query Language\uff09\uff1a\u6570\u636e\u67e5\u8be2\u8bed\u8a00\uff0c\u7528\u6765\u67e5\u8be2\u8bb0\u5f55\uff08\u6570\u636e\uff09\u3002<\/p>\n
\nshow databases; \u00a0 #\u663e\u793a\u5f53\u524dmysql\u4e2d\u7684\u6570\u636e\u5e93<\/p>\n
\nCREATE DATABASE IF NOT EXISTS mydb2 character SET GBK;<\/p>\n
\nSQL> ALTER DATABASE mydb2 character SET utf8;<\/p>\n
\nCREATE TABLE IF NOT EXISTS users(
\nid INT AUTO_INCREMENT PRIMARY KEY,#id\u4e3a\u81ea\u52a8\u589e\u957f\uff0c\u4e3b\u952e\u4e14\u4e0d\u53ef\u4e3a\u7a7a
\nusername VARCHAR(50) NOT NULL,#\u7528\u6237\u540d\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u957f\u5ea650\uff0c\u4e0d\u53ef\u4e3a\u7a7a
\nidentity VARCHAR(18) UNIQUE NOT NULL,#\u8eab\u4efd\u8bc1\u53f7\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u957f\u5ea618\uff0c\u552f\u4e00\u7ea6\u675f\uff0c\u4e0d\u53ef\u4e3a\u7a7a
\nmobile VARCHAR(11) NOT NULL#\u624b\u673a\u53f7\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u957f\u5ea6\u4e3a11\u4e14\u4e0d\u53ef\u4e3a\u7a7a
\n)CHARSET=utf8;<\/p>\n
\n\u8bed\u6cd5\uff1a DROP TABLE IF EXISTS users;<\/p>\n
\n\u8bed\u6cd5\uff1a INSERT INTO \u8868\u540d\uff08\u5217\u540d1\uff0c\u5217\u540d2 \u2026\uff09VALUES(\u5217\u503c1\uff0c\u5217\u503c2\u2026);
\nINSERT INTO users(usernames,identity,mobile)VALUES(‘admin’,’456456′,’138′);<\/p>\n
\n\u53c2\u6570\u4e0d\u8981\u8d85\u51fa\u5217\u5b9a\u4e49\u7684\u957f\u5ea6\uff0c\u65e5\u671f\u548c\u5b57\u7b26\u9700\u8981\u5355\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\u5217\u540d\u4e0e\u5217\u503c\u7684\u7c7b\u578b\u3001\u4e2a\u6570\u3001\u987a\u5e8f\u8981\u4e00\u4e00\u5bf9\u5e94\u3002<\/p>\n
\n\u8bed\u6cd5\uff1aUPDATE \u8868\u540d SET \u5217\u540d1=\u5217\u503c1,\u5217\u540d2=\u5217\u503c2 \u2026 WHERE \u5217\u540d=\u503c
\nUPDATE users SET mobile=’1382′,usernames=’\u738b\u4e8c\u9ebb2′ WHERE id=2<\/p>\n
\n\u8bed\u6cd5\uff1aDELETE FROM \u8868\u540dWHERE \u5217\u540d1=\u5217\u503c1;
\nDELETE FROM users WHERE id=2<\/p>\n
\n\u8bed\u6cd5\uff1a SELECT \u5217\u540d FROM \u8868\u540d \u3010WHERE \u2013> GROUP BY\u2013>HAVING\u2013> ORDER BY\u2013>LIMIT\u3011<\/p>\n
\n\u67e5\u8be2\u5e74\u9f84\u572820\u523040\u4e4b\u95f4\u7684\u5b66\u751f\u8bb0\u5f55<\/span>\uff1a
\nSELECT *FROM stu WHERE age BETWEEN 20 AND 40;<\/p>\n
\n\u67e5\u8be2\u5b66\u53f7\u4e3aS _ 1001 \uff0cS _ 1002\uff0cS _ 1003\u7684\u8bb0\u5f55<\/span>\uff1a
\nSELECT * FROM stu WHERE sid IN (\u2018S_1001\u2032,\u2019S_1002\u2032,\u2019S_1003\u2032);<\/p>\n
\n\u67e5\u8be2\u6027\u522b\u975e\u7537\u7684\u5b66\u751f\u8bb0\u5f55<\/span>\uff1a
\nSELECT *FROM stu WHERE NOT gender=\u2019male\u2019;<\/p>\n
\nSELECT *FROM users WHERE usernames LIKE ‘%a%’#\u5339\u914d\u5230\u5305\u542ba\u7684\u6570\u636e
\nSELECT *FROM users WHERE usernames LIKE ‘a%’#\u5339\u914d\u5230a\u5f00\u5934\u7684\u6570\u636e<\/p>\n
\nSELECT DISTINCT mobile FROM users#\u53bb\u9664\u624b\u673a\u53f7\u91cd\u590d\u7684\u6570\u636e<\/p>\n
\n\u8bed\u6cd5\uff1a\u4f7f\u7528concat(args,args2,args3) AS \u522b\u540dfrom \u522b\u540d
\nSELECT CONCAT(usernames,’:’,mobile) size FROM users#\u59d3\u540d\u548c\u624b\u673a\u53f7<\/p>\n
\nSELECT*FROM users ORDER BY age DESC#\u964d\u5e8f<\/p>\n
\n\u5f53\u9700\u8981\u7eb5\u5411\u7edf\u8ba1\u65f6\u53ef\u4ee5\u4f7f\u7528COUNT()<\/p>\n
\nSELECT COUNT(*) FROM users WHERE money>5000<\/p>\n
\nSELECT SUM(money+IFNULL(salary,0))FROM users;<\/p>\n
\n<\/strong><\/span><\/p>\n
\n\u8bed\u6cd5\uff1aSELECT*FROM \u522b\u540dLIMIT \u8d77\u59cb\u4f4d\u7f6e,\u67e5\u8be2\u51e0\u6761\u6570\u636e<\/p>\n