{"id":187,"date":"2021-08-10T13:46:50","date_gmt":"2021-08-10T05:46:50","guid":{"rendered":"https:\/\/9iwd.top\/?p=187"},"modified":"2021-08-10T14:01:10","modified_gmt":"2021-08-10T06:01:10","slug":"mysql-%e5%88%9d%e8%a7%81%e6%9f%a5%e8%af%a2%e4%b9%8b%e5%88%ab%e5%90%8d","status":"publish","type":"post","link":"http:\/\/9iwd.top\/?p=187","title":{"rendered":"No3 mysql \u521d\u89c1\u67e5\u8be2\u4e4b\u522b\u540d"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>\/\/\u7ed9\u67e5\u8be2\u7684\u5217\u8d77\u522b\u540d\uff1f\nmysql> select deptno,dname as deptname from dept;\n+--------+------------+\n| deptno | deptname   |\n+--------+------------+\n|     10 | ACCOUNTING |\n|     20 | RESEARCH   |\n|     30 | SALES      |\n|     40 | OPERATIONS |\n+--------+------------+\n\/*\n\u4f7f\u7528as\u5173\u952e\u5b57\u8d77\u522b\u540d\u3002\r\n\u6ce8\u610f\uff1a\u53ea\u662f\u5c06\u663e\u793a\u7684\u67e5\u8be2\u7ed3\u679c\u5217\u540d\u663e\u793a\u4e3adeptname\uff0c\u539f\u8868\u5217\u540d\u8fd8\u662f\u53eb\uff1adname\r\n\u8bb0\u4f4f\uff1aselect\u8bed\u53e5\u662f\u6c38\u8fdc\u90fd\u4e0d\u4f1a\u8fdb\u884c\u4fee\u6539\u64cd\u4f5c\u7684\u3002\uff08\u56e0\u4e3a\u53ea\u8d1f\u8d23\u67e5\u8be2\uff09\n*\/<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/as\u5173\u952e\u5b57\u53ef\u4ee5\u7701\u7565\u5417\uff1f\u53ef\u4ee5\u7684\nmysql> select deptno,dname deptname from dept;\r\n+--------+------------+\r\n| deptno | deptname   |\r\n+--------+------------+\r\n|     10 | ACCOUNTING |\r\n|     20 | RESEARCH   |\r\n|     30 | SALES      |\r\n|     40 | OPERATIONS |\r\n+--------+------------+<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/\u5047\u8bbe\u8d77\u522b\u540d\u7684\u65f6\u5019\uff0c\u522b\u540d\u91cc\u9762\u6709\u7a7a\u683c\uff0c\u600e\u4e48\u529e\uff1f\n\/\/DBMS\u770b\u5230\u8fd9\u6837\u7684\u8bed\u53e5\uff0c\u8fdb\u884cSQL\u8bed\u53e5\u7684\u7f16\u8bd1\uff0c\u4e0d\u7b26\u5408\u8bed\u6cd5\uff0c\u7f16\u8bd1\u62a5\u9519\u3002\r\nmysql>  select deptno,dname dept name from dept;\r\nERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'name from dept' at line 1\r\nmysql>\n\n\n\/\/\u600e\u4e48\u89e3\u51b3\uff1f\n\/\/select deptno,dname 'dept name' from dept; \/\/\u52a0\u5355\u5f15\u53f7\r\n\/\/select deptno,dname \"dept name\" from dept; \/\/\u52a0\u53cc\u5f15\u53f7\nmysql> select deptno,dname \"dept name\" from dept;\r\n+--------+------------+\r\n| deptno | dept name  |\r\n+--------+------------+\r\n|     10 | ACCOUNTING |\r\n|     20 | RESEARCH   |\r\n|     30 | SALES      |\r\n|     40 | OPERATIONS |\r\n+--------+------------+\n\/*\n\u6ce8\u610f\uff1a\u5728\u6240\u6709\u7684\u6570\u636e\u5e93\u5f53\u4e2d\uff0c\u5b57\u7b26\u4e32\u7edf\u4e00\u4f7f\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\uff0c\r\n\u5355\u5f15\u53f7\u662f\u6807\u51c6\uff0c\u53cc\u5f15\u53f7\u5728oracle\u6570\u636e\u5e93\u4e2d\u7528\u4e0d\u4e86\u3002\u4f46\u662f\u5728mysql\r\u4e2d\u53ef\u4ee5\u4f7f\u7528\u3002\r\n\r\n\u518d\u6b21\u5f3a\u8c03\uff1a\u6570\u636e\u5e93\u4e2d\u7684\u5b57\u7b26\u4e32\u90fd\u662f\u91c7\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u3002\u8fd9\u662f\u6807\u51c6\u7684\u3002\r\n\u53cc\u5f15\u53f7\u4e0d\u6807\u51c6\u3002\n*\/<\/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\/187"}],"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=187"}],"version-history":[{"count":3,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/187\/revisions"}],"predecessor-version":[{"id":195,"href":"http:\/\/9iwd.top\/index.php?rest_route=\/wp\/v2\/posts\/187\/revisions\/195"}],"wp:attachment":[{"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=187"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=187"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/9iwd.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=187"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}