{"id":212,"date":"2021-08-10T18:11:17","date_gmt":"2021-08-10T10:11:17","guid":{"rendered":"https:\/\/9iwd.top\/?p=212"},"modified":"2021-08-10T18:11:18","modified_gmt":"2021-08-10T10:11:18","slug":"no6-mysql-%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"http:\/\/9iwd.top\/?p=212","title":{"rendered":"No6 mysql \u6392\u5e8f"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\/\/\u67e5\u8be2\u6240\u6709\u5458\u5de5\u85aa\u8d44\uff0c\u6392\u5e8f\uff1f\n\/\/ \u9ed8\u8ba4\u662f\u5347\u5e8f\uff01\uff01\uff01\nmysql> select ename,sal from emp order by sal;\r\n+--------+---------+\r\n| ename  | sal     |\r\n+--------+---------+\r\n| SMITH  |  800.00 |\r\n| JAMES  |  950.00 |\r\n| ADAMS  | 1100.00 |\r\n| WARD   | 1250.00 |\r\n| MARTIN | 1250.00 |\r\n| MILLER | 1300.00 |\r\n| TURNER | 1500.00 |\r\n| ALLEN  | 1600.00 |\r\n| CLARK  | 2450.00 |\r\n| BLAKE  | 2850.00 |\r\n| JONES  | 2975.00 |\r\n| SCOTT  | 3000.00 |\r\n| FORD   | 3000.00 |\r\n| KING   | 5000.00 |\r\n+--------+---------+<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u600e\u4e48\u964d\u5e8f\uff1f\n\/\/\u4f7f\u7528\u5173\u952e\u5b57 desc\nmysql> select ename,sal from emp order by sal desc;\r\n+--------+---------+\r\n| ename  | sal     |\r\n+--------+---------+\r\n| KING   | 5000.00 |\r\n| SCOTT  | 3000.00 |\r\n| FORD   | 3000.00 |\r\n| JONES  | 2975.00 |\r\n| BLAKE  | 2850.00 |\r\n| CLARK  | 2450.00 |\r\n| ALLEN  | 1600.00 |\r\n| TURNER | 1500.00 |\r\n| MILLER | 1300.00 |\r\n| WARD   | 1250.00 |\r\n| MARTIN | 1250.00 |\r\n| ADAMS  | 1100.00 |\r\n| JAMES  |  950.00 |\r\n| SMITH  |  800.00 |\r\n+--------+---------+<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u6307\u5b9a\u5347\u5e8f\uff1f\nmysql> select ename,sal from emp order by sal asc;\r\n+--------+---------+\r\n| ename  | sal     |\r\n+--------+---------+\r\n| SMITH  |  800.00 |\r\n| JAMES  |  950.00 |\r\n| ADAMS  | 1100.00 |\r\n| WARD   | 1250.00 |\r\n| MARTIN | 1250.00 |\r\n| MILLER | 1300.00 |\r\n| TURNER | 1500.00 |\r\n| ALLEN  | 1600.00 |\r\n| CLARK  | 2450.00 |\r\n| BLAKE  | 2850.00 |\r\n| JONES  | 2975.00 |\r\n| SCOTT  | 3000.00 |\r\n| FORD   | 3000.00 |\r\n| KING   | 5000.00 |\r\n+--------+---------+<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u53ef\u4ee5\u4e24\u4e2a\u5b57\u6bb5\u6392\u5e8f\u5417\uff1f\u6216\u8005\u8bf4\u6309\u7167\u591a\u4e2a\u5b57\u6bb5\u6392\u5e8f\uff1f\n\/\/\u67e5\u8be2\u5458\u5de5\u540d\u5b57\u548c\u85aa\u8d44\uff0c\u8981\u6c42\u6309\u7167\u85aa\u8d44\u5347\u5e8f\uff0c\u5982\u679c\u85aa\u8d44\u4e00\u6837\u7684\u8bdd\uff0c\n\/\/\u518d\u6309\u7167\u540d\u5b57\u5347\u5e8f\u6392\u5217\u3002\n\nmysql> select ename,sal from emp order by sal asc, ename asc;\n+--------+---------+\n| ename  | sal     |\n+--------+---------+\n| SMITH  |  800.00 |\n| JAMES  |  950.00 |\n| ADAMS  | 1100.00 |\n| MARTIN | 1250.00 |\n| WARD   | 1250.00 |\n| MILLER | 1300.00 |\n| TURNER | 1500.00 |\n| ALLEN  | 1600.00 |\n| CLARK  | 2450.00 |\n| BLAKE  | 2850.00 |\n| JONES  | 2975.00 |\n| FORD   | 3000.00 |\n| SCOTT  | 3000.00 |\n| KING   | 5000.00 |\n+--------+---------+\n\/\/ sal\u5728\u524d\uff0c\u8d77\u4e3b\u5bfc\uff0c\u53ea\u6709sal\u76f8\u7b49\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u8003\u8651\u542f\u7528ename\u6392\u5e8f\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u4e86\u89e3\uff1a\u6839\u636e\u5b57\u6bb5\u7684\u4f4d\u7f6e\u4e5f\u53ef\u4ee5\u6392\u5e8f\nselect ename,sal from emp order by 2; \n\/\/ 2\u8868\u793a\u7b2c\u4e8c\u5217\u3002\u7b2c\u4e8c\u5217\u662fsal\n\/\/\u6309\u7167\u67e5\u8be2\u7ed3\u679c\u7684\u7b2c2\u5217sal\u6392\u5e8f\n\/\/\u4e86\u89e3\u4e00\u4e0b\uff0c\u4e0d\u5efa\u8bae\u5728\u5f00\u53d1\u4e2d\u8fd9\u6837\u5199\uff0c\u56e0\u4e3a\u4e0d\u5065\u58ee\u3002\n\/\/\u56e0\u4e3a\u5217\u7684\u987a\u5e8f\u5f88\u5bb9\u6613\u53d1\u751f\u6539\u53d8\uff0c\u5217\u987a\u5e8f\u4fee\u6539\u4e4b\u540e\uff0c2\u5c31\u5e9f\u4e86\u3002<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u7efc\u5408\u4e00\u70b9\u7684\u6848\u4f8b\uff1a\r\n\/\/\u627e\u51fa\u5de5\u8d44\u57281250\u52303000\u4e4b\u95f4\u7684\u5458\u5de5\u4fe1\u606f\uff0c\u8981\u6c42\u6309\u7167\u85aa\u8d44\u964d\u5e8f\u6392\u5217\u3002\nmysql> select\r\n    -> ename,sal\r\n    -> from\r\n    -> emp\r\n    -> where\r\n    -> sal between 1250 and 3000\r\n    -> order by\r\n    -> sal desc;\r\n+--------+---------+\r\n| ename  | sal     |\r\n+--------+---------+\r\n| SCOTT  | 3000.00 |\r\n| FORD   | 3000.00 |\r\n| JONES  | 2975.00 |\r\n| BLAKE  | 2850.00 |\r\n| CLARK  | 2450.00 |\r\n| ALLEN  | 1600.00 |\r\n| TURNER | 1500.00 |\r\n| MILLER | 1300.00 |\r\n| WARD   | 1250.00 |\r\n| MARTIN | 1250.00 |\r\n+--------+---------+\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u603b\u7ed3:\n\u5173\u952e\u5b57\u987a\u5e8f\u4e0d\u80fd\u53d8\uff1a\r\nselect\r\n\t...\r\nfrom\r\n\t...\r\nwhere\r\n\t...\r\norder by\r\n\t...\r\n\r\n\u4ee5\u4e0a\u8bed\u53e5\u7684\u6267\u884c\u987a\u5e8f\u5fc5\u987b\u638c\u63e1\uff1a\r\n\t\u7b2c\u4e00\u6b65\uff1afrom\r\n\t\u7b2c\u4e8c\u6b65\uff1awhere\r\n\t\u7b2c\u4e09\u6b65\uff1aselect\r\n\t\u7b2c\u56db\u6b65\uff1aorder by\uff08\u6392\u5e8f\u603b\u662f\u5728\u6700\u540e\u6267\u884c\uff01\uff09<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"_links":{"self":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/212"}],"collection":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=212"}],"version-history":[{"count":1,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/212\/revisions"}],"predecessor-version":[{"id":213,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/212\/revisions\/213"}],"wp:attachment":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=212"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=212"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=212"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}