{"id":602,"date":"2020-11-02T10:23:43","date_gmt":"2020-11-02T02:23:43","guid":{"rendered":"https:\/\/www.specialwu.com\/?p=602"},"modified":"2021-06-07T07:57:49","modified_gmt":"2021-06-06T23:57:49","slug":"mysql%e7%bb%83%e4%b9%a0","status":"publish","type":"post","link":"http:\/\/www.specialwu.com\/?p=602","title":{"rendered":"\u5173\u7cfb\u578b\u6570\u636e\u5e93&#8211;Mysql"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_61 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #000000;color:#000000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #000000;color:#000000\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" 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title=\"3.1\u5728Linux\u4e0a\u7684\u57fa\u672c\u64cd\u4f5c\">3.1\u5728Linux\u4e0a\u7684\u57fa\u672c\u64cd\u4f5c<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/www.specialwu.com\/?p=602\/#3%E5%9C%A8Windows%E4%B8%8A%E6%93%8D%E4%BD%9C\" title=\"3\u5728Windows\u4e0a\u64cd\u4f5c\">3\u5728Windows\u4e0a\u64cd\u4f5c<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/www.specialwu.com\/?p=602\/#22SQL%E8%AF%AD%E5%8F%A5%E5%9F%BA%E7%A1%80\" title=\"2.2SQL\u8bed\u53e5\u57fa\u7840\">2.2SQL\u8bed\u53e5\u57fa\u7840<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/www.specialwu.com\/?p=602\/#23%E5%B8%B8%E8%A7%81%E7%9A%84%E6%95%B0%E6%8D%AE%E5%BA%93%E5%AF%B9%E8%B1%A1\" title=\"2.3\u5e38\u89c1\u7684\u6570\u636e\u5e93\u5bf9\u8c61\">2.3\u5e38\u89c1\u7684\u6570\u636e\u5e93\u5bf9\u8c61<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/www.specialwu.com\/?p=602\/#%E4%B8%8EMySQL%E5%BB%BA%E7%AB%8B%E8%BF%9E%E6%8E%A5\" title=\"\u4e0eMySQL\u5efa\u7acb\u8fde\u63a5\">\u4e0eMySQL\u5efa\u7acb\u8fde\u63a5<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/www.specialwu.com\/?p=602\/#%E6%A0%B8%E5%BF%83%E7%9A%84%E9%97%AE%E9%A2%98\" title=\"\u6838\u5fc3\u7684\u95ee\u9898\">\u6838\u5fc3\u7684\u95ee\u9898<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"http:\/\/www.specialwu.com\/?p=602\/#Mysql%E4%B8%89%E5%A4%A7%E8%8C%83%E5%BC%8F\" title=\"Mysql\u4e09\u5927\u8303\u5f0f\">Mysql\u4e09\u5927\u8303\u5f0f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"http:\/\/www.specialwu.com\/?p=602\/#%E6%95%B0%E6%8D%AE%E5%BA%93%E4%BA%8B%E7%89%A9\" title=\"\u6570\u636e\u5e93\u4e8b\u7269\">\u6570\u636e\u5e93\u4e8b\u7269<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"http:\/\/www.specialwu.com\/?p=602\/#%E6%95%B0%E6%8D%AE%E5%BA%93%E5%B8%B8%E8%A7%81%E7%9A%84%E5%B9%B6%E5%8F%91%E5%BC%82%E5%B8%B8%E3%80%82\" title=\"\u6570\u636e\u5e93\u5e38\u89c1\u7684\u5e76\u53d1\u5f02\u5e38\u3002\">\u6570\u636e\u5e93\u5e38\u89c1\u7684\u5e76\u53d1\u5f02\u5e38\u3002<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1><span class=\"ez-toc-section\" id=\"%E4%B8%80%E3%80%81%E6%98%AF%E4%BB%80%E4%B9%88\"><\/span>\u4e00\u3001\u662f\u4ec0\u4e48<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<p>MySQL \u662f\u4e00\u4e2a\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u7531\u745e\u5178 MySQL AB \u516c\u53f8\u5f00\u53d1\uff0c\u76ee\u524d\u5c5e\u4e8e Oracle \u516c\u53f8\u3002MySQL \u662f\u4e00\u79cd\u5173\u8054\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u5173\u8054\u6570\u636e\u5e93\u5c06\u6570\u636e\u4fdd\u5b58\u5728\u4e0d\u540c\u7684\u8868\u4e2d\uff0c\u800c\u4e0d\u662f\u5c06\u6240\u6709\u6570\u636e\u653e\u5728\u4e00\u4e2a\u5927\u4ed3\u5e93\u5185\uff0c\u8fd9\u6837\u5c31\u589e\u52a0\u4e86\u901f\u5ea6\u5e76\u63d0\u9ad8\u4e86\u7075\u6d3b\u6027\u3002RDBMS \u5373\u5173\u7cfb\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf(Relational Database Management System)\uff0c\u4e60\u60ef\u4e0a\u628a\u6570\u636e\u5e93\u548c\u6570\u636e\u7ba1\u7406\u7cfb\u7edf\u7edf\u79f0\u4e3a\u6570\u636e\u5e93\u3002<\/p>\n<h1><span class=\"ez-toc-section\" id=\"%E4%BA%8C%E3%80%81%E6%80%8E%E4%B9%88%E7%94%A8\"><\/span>\u4e8c\u3001\u600e\u4e48\u7528<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2><span class=\"ez-toc-section\" id=\"21MySQL%E5%AE%89%E8%A3%85%E5%9C%A8Linux%E7%B3%BB%E7%BB%9F%E4%B8%8A\"><\/span>2.1MySQL\u5b89\u88c5\u5728Linux\u7cfb\u7edf\u4e0a<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>MySQL\u901a\u5e38\u88c5\u8f7dLinux\u4e0a\u6216Windows\u4e0a\u6765\u8fdb\u884c\u4f7f\u7528\uff0cWindows\u4e0a\u5b89\u88c5\u8fc7\u7a0b\u7565\u3002<\/p>\n<pre><code class=\"language-shell line-numbers\">#\u901a\u8fc7\u8fde\u63a5\u8fdb\u884c\u4e0b\u8f7d\nwget https:\/\/dev.mysql.com\/get\/mysql80-community-release-el7-3.noarch.rpm\n#\u5b89\u88c5\nyum install mysql80-community-release-el7-3.noarch.rpm\n#\u5b89\u88c5utils\u5de5\u5177\nyum install yum-utils -y\n#\u5173\u95edMySQL8\u670d\u52a1\nyum-config-manager --disable mysql80-community \n#\u5b89\u88c5MySQL5.7\nyum-config-manager --enable mysql57-community\n#:\u82e5\u542f\u52a8\u65f6\u51fa\u73b0\u8be5\u5f02\u5e38 Unit not found.\nyum install -y mysql-community-server\n#\u542f\u52a8MySQL\nsystemctl start mysqld\n#\u767b\u9646\nmysql -uroot -p\n<\/code><\/pre>\n<p><img src=\"https:\/\/www.specialwu.com\/wp-content\/uploads\/2021\/02\/mysql.png\" alt=\"\" \/><\/p>\n<h3><span class=\"ez-toc-section\" id=\"31%E5%9C%A8Linux%E4%B8%8A%E7%9A%84%E5%9F%BA%E6%9C%AC%E6%93%8D%E4%BD%9C\"><\/span>3.1\u5728Linux\u4e0a\u7684\u57fa\u672c\u64cd\u4f5c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ol>\n<li>\u67e5\u770b\u6570\u636e\u5e93<\/li>\n<\/ol>\n<pre><code class=\"language-sql line-numbers\">mysql&gt; show databases;\n+--------------------+\n| Database           |\n+--------------------+\n| information_schema |\n| firstmysql         |\n| mysql              |\n| performance_schema |\n+--------------------+\n4 rows in set (0.12 sec)\nmysql&gt; use web;\nReading table information for completion of table and column names\nYou can turn off this feature to get a quicker startup with -A\n\nDatabase changed\nmysql&gt; show tables;\n+---------------+\n| Tables_in_web |\n+---------------+\n| articles      |\n| articletype   |\n| comments      |\n| login         |\n| media         |\n| notice        |\n| visit         |\n+---------------+\n7 rows in set (0.00 sec)\nmysql&gt; select * from login;\n+--------+----------+----------------------------------+--------------+\n| userId | username | userpassword                     | mail         |\n+--------+----------+----------------------------------+--------------+\n|      2 | admin    | A98E9189771112C70FC091BE683DC804 | 19063@qq.com |\n+--------+----------+----------------------------------+--------------+\n1 row in set (0.05 sec)\n<\/code><\/pre>\n<ol start=\"2\">\n<li>\u67e5\u8be2\u6570\u636e\u5e93\u5bb9\u91cf<\/li>\n<\/ol>\n<pre><code class=\"language-sql line-numbers\">mysql&gt; SELECT \n    -&gt; table_schema AS '\u6570\u636e\u5e93',\n    -&gt; SUM(table_rows) AS '\u8bb0\u5f55\u6570',\n    -&gt; SUM(TRUNCATE(data_length\/1024\/1024, 2)) AS '\u6570\u636e\u5bb9\u91cf(MB)',\n    -&gt; SUM(TRUNCATE(index_length\/1024\/1024, 2)) AS '\u7d22\u5f15\u5bb9\u91cf(MB)'\n    -&gt; FROM information_schema.tables\n    -&gt; GROUP BY table_schema\n    -&gt; ORDER BY SUM(data_length) DESC, SUM(index_length) DESC;\n+--------------------+-----------+------------------+------------------+\n| \u6570\u636e\u5e93             | \u8bb0\u5f55\u6570    | \u6570\u636e\u5bb9\u91cf(MB)     | \u7d22\u5f15\u5bb9\u91cf(MB)     |\n+--------------------+-----------+------------------+------------------+\n| firstmysql         |      2160 |            22.54 |             0.64 |\n| mysql              |      4098 |             2.19 |             0.20 |\n| phpmyadmin         |         0 |             0.19 |             0.06 |\n| information_schema |      NULL |             0.10 |             0.00 |\n| web                |        26 |             0.09 |             0.00 |\n| sys                |         6 |             0.01 |             0.00 |\n| performance_schema |   1332090 |             0.00 |             0.00 |\n+--------------------+-----------+------------------+------------------+\n7 rows in set (0.63 sec)\n<\/code><\/pre>\n<h3><span class=\"ez-toc-section\" id=\"3%E5%9C%A8Windows%E4%B8%8A%E6%93%8D%E4%BD%9C\"><\/span>3\u5728Windows\u4e0a\u64cd\u4f5c<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u521b\u5efa\u8868<\/p>\n<pre><code class=\"language-sql line-numbers\">CREATE TABLE `goods` (\n  `id` bigint(20) NOT NULL AUTO_INCREMENT,\n  `goodsName` varchar(40) NOT NULL,\n  `billStatus` int(11) NOT NULL,\n  `goodsPrice` float NOT NULL,\n  `goodsCount` bigint(20) NOT NULL,\n  `creationTime` date NOT NULL,\n  `filename` varchar(100) DEFAULT NULL,\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=utf8\n#\u628a\u7b2c\u67e5\u51fa\u6765\u7684\u8868\u4f5c\u4e3a\u8fd9\u5f20\u65b0\u8868\nCREATE TABLE ss as select * from goods\n<\/code><\/pre>\n<p>\u4fee\u6539\u8868\u7ed3\u6784:\u589e\u52a0\u5217\u5b9a\u4e49\u3001\u4fee\u6539\u5217\u5b9a\u4e49\u3001\u5220\u9664\u5217\uff0c\u91cd\u547d\u540d\u5217<\/p>\n<pre><code class=\"language-sql line-numbers\">alter table ss add name int(1);\nalter table ss modify name varchar(20);\nalter table ss drop name;\nalter table ss rename to names;\n<\/code><\/pre>\n<p>\u5220\u9664\u8868(\u8868\u7ed3\u6784\u88ab\u5220\u9664\u8868\u5bf9\u8c61\u4e0d\u5b58\u5728\uff0c\u8868\u6570\u636e\u88ab\u5220\u9664\uff0c\u8868\u7d22\u5f15\u7ea6\u675f\u88ab\u5220\u9664)<\/p>\n<pre><code class=\"language-sql line-numbers\">drop table ss;\n<\/code><\/pre>\n<p>truncate\u8868(\u88ab\u79f0\u4e3a\u622a\u65ad\u67d0\u4e2a\u8868\uff0c\u5b83\u7684\u4f5c\u7528\u662f\u5220\u9664\u8be5\u8868\u91cc\u6240\u6709\u7684\u6570\u636e\uff0c\u4f46\u4fdd\u7559\u8868\u7ed3\u6784)<\/p>\n<pre><code class=\"language-sql line-numbers\">truncate ss\n<\/code><\/pre>\n<h2><span class=\"ez-toc-section\" id=\"22SQL%E8%AF%AD%E5%8F%A5%E5%9F%BA%E7%A1%80\"><\/span>2.2SQL\u8bed\u53e5\u57fa\u7840<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>SQL\u7684\u5168\u79f0\u662fStructured Query Language\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff0c\u662f\u64cd\u4f5c\u548c\u68c0\u7d22\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6807\u6ce8\u8bed\u8a00\u3002\u4f7f\u7528SQL\u8bed\u53e5\u53ef\u5b8c\u6210\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u4fe1\u606f\uff0c\u5bf9\u6570\u636e\u5e93\u4fe1\u606f\u8fdb\u884c\u66f4\u65b0\uff0c\u6539\u53d8\u6570\u636e\u5e93\u7684\u7ed3\u6784\uff0c\u66f4\u6539\u7cfb\u7edf\u5b89\u5168\u8bbe\u7f6e\uff0c\u589e\u52a0\u6216\u56de\u6536\u7528\u6237\u5bf9\u6570\u636e\u5e93\u3001\u8868\u7684\u8bb8\u53ef\u6743\u9650\u3002<br \/>\nSQL\u8bed\u53e5\u53ef\u5206\u4e3a\u4e94\u79cd\u7c7b\u578b<\/p>\n<ul>\n<li>DQL\uff08Data Query Language\uff0c\u6570\u636e\u5e93\u67e5\u8be2\u8bed\u8a00\uff09\u3002<\/li>\n<li>DML\uff08Data Manipulation Language,\u6570\u636e\u64cd\u4f5c\u8bed\u8a00\uff09\u8bed\u53e5 insert\u3001update\u3001delete<\/li>\n<li>DDL\uff08Data Difinition Language,\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09\u8bed\u53e5create\u3001alter\u3001drop\u3001truncate<\/li>\n<li>DCL\uff08Data Control Language,\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff09\u8bed\u53e5grant\u3001revoke<\/li>\n<li>\u4e8b\u7269\u63a7\u5236\u8bed\u53e5\uff0c\u5173\u952e\u5b57\u6709commit\u3001rollback\u3001savepoint<\/li>\n<\/ul>\n<p>sql\u8bed\u53e5\u6267\u884c\u987a\u5e8f<\/p>\n<pre><code class=\"language-sql line-numbers\">(8)\u00a0 SELECT\u00a0 (9) DISTINCT (11) &lt;TOP_specification&gt; &lt;select_list&gt;\u00a0\n(1)\u00a0 FROM &lt;left_table&gt;\u00a0\u00a0\n(3) &lt;join_type&gt; JOIN &lt;right_table&gt;\u00a0\n(2) ON &lt;join_condition&gt;\u00a0\n(4) WHERE &lt;where_condition&gt;\u00a0\n(5) GROUP BY &lt;group_by_list&gt;\u00a0\n(6) WITH {CUBE | ROLLUP}\u00a0\n(7) HAVING &lt;having_condition&gt;\u00a0\n(10) ORDER BY &lt;order_by_list&gt;\n<\/code><\/pre>\n<h2><span class=\"ez-toc-section\" id=\"23%E5%B8%B8%E8%A7%81%E7%9A%84%E6%95%B0%E6%8D%AE%E5%BA%93%E5%AF%B9%E8%B1%A1\"><\/span>2.3\u5e38\u89c1\u7684\u6570\u636e\u5e93\u5bf9\u8c61<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>\u8868\uff08Table \uff09<\/li>\n<\/ol>\n<p>\u6570\u636e\u5e93\u4e2d\u7684\u8868\u4e0e\u6211\u4eec\u65e5\u5e38\u751f\u6d3b\u4e2d\u4f7f\u7528\u7684\u8868\u683c\u7c7b\u4f3c\uff0c\u5b83\u4e5f\u662f\u7531\u884c\uff08Row\uff09 \u548c\u5217\uff08Column\uff09\u7ec4\u6210\u7684\u3002\u5217\u7531\u540c\u7c7b\u7684\u4fe1\u606f\u7ec4\u6210\uff0c\u6bcf\u5217\u53c8\u79f0\u4e3a\u4e00\u4e2a\u5b57\u6bb5\uff0c\u6bcf\u5217\u7684\u6807\u9898\u79f0\u4e3a\u5b57\u6bb5\u540d\u3002\u884c\u5305\u62ec\u4e86\u82e5\u5e72\u5217\u4fe1\u606f\u9879\u3002\u4e00\u884c\u6570\u636e\u79f0\u4e3a\u4e00\u4e2a\u6216\u4e00\u6761\u8bb0\u5f55\uff0c\u5b83\u8868\u8fbe\u6709\u4e00\u5b9a\u610f\u4e49\u7684\u4fe1\u606f\u7ec4\u5408\u3002\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u7531\u4e00\u6761\u6216\u591a\u6761\u8bb0\u5f55\u7ec4\u6210\uff0c\u6ca1\u6709\u8bb0\u5f55\u7684\u8868\u79f0\u4e3a\u7a7a\u8868\u3002\u6bcf\u4e2a\u8868\u4e2d\u901a\u5e38\u90fd\u6709\u4e00\u4e2a\u4e3b\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u60df\u4e00\u5730\u786e\u5b9a\u4e00\u6761\u8bb0\u5f55\u3002<\/p>\n<ol start=\"2\">\n<li>\u7ea6\u675fconstraint<\/li>\n<\/ol>\n<p>\u6267\u884c\u6570\u636e\u6821\u9a8c\u7684\u89c4\u5219\uff0c\u7528\u4e8e\u4fdd\u8bc1\u6570\u636e\u5b8c\u6574\u6027\u7684\u89c4\u5219\uff1b\u7ea6\u675f\u53c8\u53ef\u5206\u4e3a\u5355\u5217\u7ea6\u675f\u4e0e\u591a\u5217\u7ea6\u675f\uff1b\u5efa\u8868\u7684\u65f6\u5019\u4e3a\u76f8\u5e94\u6570\u636e\u5217\u5236\u5b9a\u7ea6\u675f\uff0c\u5efa\u8868\u540e\uff0c\u4ee5\u4fee\u6539\u8868\u7684\u65b9\u5f0f\u6765\u589e\u52a0\u7ea6\u675f\uff1b<br \/>\n<strong>\u6570\u636e\u5e93\u4e3b\u952e<\/strong>\uff0c\u6307\u7684\u662f\u4e00\u4e2a\u5217\u6216\u591a\u5217\u7684\u7ec4\u5408\uff0c\u5176\u503c\u80fd\u552f\u4e00\u5730\u6807\u8bc6\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\uff0c\u901a\u8fc7\u5b83\u53ef\u5f3a\u5236\u8868\u7684\u5b9e\u4f53\u5b8c\u6574\u6027\u3002\u4e3b\u952e\u4e3b\u8981\u662f\u7528\u4e0e\u5176\u4ed6\u8868\u7684\u5916\u952e\u5173\u8054\uff0c\u4ee5\u53ca\u672c\u8bb0\u5f55\u7684\u4fee\u6539\u4e0e\u5220\u9664\u3002<br \/>\n\u4f5c\u7528:<br \/>\n1) \u4fdd\u8bc1\u5b9e\u4f53\u7684\u5b8c\u6574\u6027;<br \/>\n2) \u52a0\u5feb\u6570\u636e\u5e93\u7684\u64cd\u4f5c\u901f\u5ea6<br \/>\n3) \u5728\u8868\u4e2d\u6dfb\u52a0\u65b0\u8bb0\u5f55\u65f6\uff0cDBMS\u4f1a\u81ea\u52a8\u68c0\u67e5\u65b0\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\uff0c\u4e0d\u5141\u8bb8\u8be5\u503c\u4e0e\u5176\u4ed6\u8bb0\u5f55\u7684\u4e3b\u952e\u503c\u91cd\u590d\u3002<br \/>\n4) DBMS\u81ea\u52a8\u6309\u4e3b\u952e\u503c\u7684\u987a\u5e8f\u663e\u793a\u8868\u4e2d\u7684\u8bb0\u5f55\u3002\u5982\u679c\u6ca1\u6709\u5b9a\u4e49\u4e3b\u952e\uff0c\u5219\u6309\u8f93\u5165\u8bb0\u5f55\u7684\u987a\u5e8f\u663e\u793a\u8868\u4e2d\u7684\u8bb0\u5f55\u3002<\/p>\n<ul>\n<li>\u4e3b\u952e\u7ea6\u675f\uff08Primay Key Coustraint\uff09 \u552f\u4e00\u6027\uff0c\u975e\u7a7a\u6027<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">CREATE TABLE `goods` (\n  `id` bigint(20) NOT NULL AUTO_INCREMENT,\n  PRIMARY KEY (`id`)\n)\n<\/code><\/pre>\n<ul>\n<li>\u552f\u4e00\u7ea6\u675f \uff08Unique Counstraint\uff09\u552f\u4e00\u6027\uff0c\u53ef\u4ee5\u7a7a\uff0c\u4f46\u53ea\u80fd\u6709\u4e00\u4e2a,\u5f53 \u4e3a\u67d0\u5217\u521b\u5efa\u552f \u7ea6\u675f\u65f6\uff0c MySQL \u4f1a\u4e3a\u8be5\u5217\u76f8\u5e94\u5730\u521b\u5efa\u552f\u4e00\u7d22\u5f15 \u5982\u679c\u4e0d\u7ed9\u552f\u4e00\u7ea6\u675f\u8d77\u540d\uff0c\u8be5\u552f \u7ea6\u675f\u9ed8\u8ba4\u4e0e\u5217\u540d\u76f8\u540c\u3002<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">#\u5efa\u8868\u65f6\u521b\u5efa\u552f \u7ea6\u675f\uff0c\u4f7f\u7528\u8868\u7ea7\u7ea6\u675f\u8bed\u6cd5\u5efa\u7acb\u7ea6\u675f\ncreate table unique test2 \n(\n#\u5efa\u7acb\u4e86\u975e\u7a7a\u7ea6\u675f\uff0c\u8fd9\u610f\u5473\u7740 test id \u4e0d\u53ef\u4ee5\u4e3a null\ntest id int not null, test name varchar (255) , \ntest pass varchar(255) , \n#\u4f7f\u7528\u8868\u7ea7\u7ea6\u675f\u8bed\u6cd5\u5efa\u7acb\u552f \u7ea6\u675f\nunique (test_name) , \n#\u4f7f\u7528\u8868\u7ea7\u7ea6\u675f\u8bed\u6cd5\u5efa\u7acb\u552f\u4e00\u7ea6\u675f\uff0c\u800c\u4e14\u6307\u5b9a\u7ea6\u675f\u540d\nconstraint test2_uk unique(test_pass)\n);\n<\/code><\/pre>\n<ul>\n<li>\u68c0\u67e5\u7ea6\u675f \uff08Check Counstraint\uff09\u5bf9\u8be5\u5217\u6570\u636e\u7684\u8303\u56f4\u3001\u683c\u5f0f\u7684\u9650\u5236\uff08\u5982\uff1a\u5e74\u9f84\u3001\u6027\u522b\u7b49\uff09<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">create table hehe \n(\nhehe age int not null , \nhehe_gender varchar(2) null,\ncheck(age&gt;0)\n);\n<\/code><\/pre>\n<ul>\n<li>\u975e\u7a7a\u7ea6\u675f \uff08NOT NULL Counstraint\uff09\u6307\u5b9a\u67d0\u5217\u4e0d\u80fd\u4e3a\u7a7a<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">create table hehe \n(\n#\u5efa\u7acb\u4e86\u975e\u7a7a\u7ea6\u675f\uff0c\u8fd9\u610f\u5473\u7740 hehe id \u4e0d\u53ef null\nhehe id int not null , \n# MySQL \u7a7a\u7ea6\u675f\u4e0d\u80fd \u5b9a\u540d\u5b57\nhehe_ name varchar(255) default ' xyz' not null , \n#\u4e0b\u9762\u5217\u53ef\u4ee5\u4e3a\u7a7a \u9ed8\u8ba4\u5c31\u662f\u53ef\u4ee5\u4e3a\nhehe_gender varchar(2) null\n);\n#\u589e\u52a0\u975e\u7a7a\u7ea6\u675f\nalter table hehe \nmodify hehe gender varchar(2) not null \n#\u53d6\u6d88\u975e\u7a7a\u7ea6\u675f\nalter table hehe \nmodify hehe_name varchar(2) null ; \n#\u53d6\u6d88\u975e\u7a7a\u7ea6\u675f \u5e76\u6307\u5b9a\u9ed8\u8ba4\u503c\nalter table hehe \nmodify hehe_ name varchar(255) default 'abc' null ;\n<\/code><\/pre>\n<ul>\n<li>\u5916\u952e\u7ea6\u675f \uff08Foreign Key Counstraint\uff09\u9700\u8981\u5efa\u7acb\u4e24\u8868\u95f4\u7684\u5173\u7cfb\u5e76\u5f15\u7528\u4e3b\u8868\u7684\u5217<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">#\u4e3a\u4e86\u4fdd\u8bc1\u4ece\u8868\u53c2\u7167\u7684\u4e3b\u8868\u5b58\u5728\uff0c\u901a\u5e38\u5e94\u8be5\u5148\u5efa\u4e3b\u8868\ncreate table teacher table \n(\n# auto increment: \u4ee3\u8868\u6570\u636e\u5e93\u7684\u81ea\u52a8\u7f16\u53f7\u7b56\u7565\uff0c\u901a\u5e38\u7528\u4f5c\u6570\u636e\u88a4\u7684\u903b\u8f91\u4e3b\u952e\nteacher id int auto i ncrement , \nteacher name varchar(255 ) , primary key(teacher id)\n);\n<\/code><\/pre>\n<ol start=\"2\">\n<li>\u7d22\u5f15\uff08Index\uff09<\/li>\n<\/ol>\n<p>\u7d22\u5f15\u662f\u6839\u636e\u6307\u5b9a\u7684\u6570\u636e\u5e93\u8868\u5217\u5efa\u7acb\u8d77\u6765\u7684\u987a\u5e8f\u3002\u5b83\u63d0\u4f9b\u4e86\u5feb\u901f\u8bbf\u95ee\u6570\u636e\u7684\u9014\u5f84\uff0c\u5e76\u4e14\u53ef\u76d1\u7763\u8868\u7684\u6570\u636e\uff0c\u4f7f\u5176\u7d22\u5f15\u6240\u6307\u5411\u7684\u5217\u4e2d\u7684\u6570\u636e\u4e0d\u91cd\u590d\u3002mysql\u4f7f\u7528information_schema\u6570\u636e\u5e93\u4e2d\u7684STATISTICS\u8868\u6765\u4fdd\u5b58\u8be5\u6570\u636e\u5e93\u5b9e\u4f8b\u4e2d\u7684\u6240\u6709\u4fe1\u606f\u3002<br \/>\n\u521b\u5efa\u7d22\u5f15\u6709\u4e24\u79cd\u65b9\u6cd5\uff1b<br \/>\n\u81ea\u52a8\uff1a\u5f53\u5728\u8868\u4e0a\u5b9a\u4e49\u4e3b\u952e\u7ea6\u675f\u3001\u552f\u4e00\u7ea6\u675f\u548c\u5916\u952e\u7ea6\u675f\u65f6\u7cfb\u7edf\u4e3a\u8be5\u6570\u636e\u5217\u81ea\u52a8\u521b\u5efa\u7d22\u5f15\uff1b<br \/>\n\u624b\u52a8\uff1acreate index&#8230;<br \/>\n\u7d22\u5f15\u6709\u4ee5\u4e0b\u51e0\u79cd\u7c7b\u578b\uff1b<br \/>\n\u4e3b\u952e\u7d22\u5f15\uff08PRIMARY KEY\uff09<br \/>\n\u552f\u4e00\u7d22\u5f15\uff08UNIQUE\uff09<br \/>\n\u5e38\u89c4\u7d22\u5f15\uff08INDEX\uff09<br \/>\n\u5168\u6587\u7d22\u5f15\uff08FULLTEXT\uff09<\/p>\n<pre><code class=\"language-sql line-numbers\">create ndex index name \non table name (column[ , column) . ..);\n\ndrop ndex \u7d22\u5f15\u540d on \u8868\u540d\n<\/code><\/pre>\n<ol start=\"3\">\n<li>\u89c6\u56fe\uff08View\uff09<\/li>\n<\/ol>\n<p>\u89c6\u56fe\u770b\u4e0a\u53bb\u540c\u8868\u4f3c\u4e4e\u4e00\u6a21\u4e00\u6837\uff0c\u5177\u6709\u4e00\u7ec4\u547d\u540d\u7684\u5b57\u6bb5\u548c\u6570\u636e\u9879\uff0c\u4f46\u5b83\u5176\u5b9e\u662f\u4e00\u4e2a\u865a\u62df\u7684\u8868\uff0c\u5728\u6570\u636e\u5e93\u4e2d\u5e76\u4e0d\u5b9e\u9645\u5b58\u3002\u5728\u89c6\u56fe\u662f\u7531\u67e5\u8be2\u6570\u636e\u5e93\u8868\u4ea7\u751f\u7684\uff0c\u5b83\u9650\u5236\u4e86\u7528\u6237\u80fd\u770b\u5230\u548c\u4fee\u6539\u7684\u6570\u636e\u3002\u7531\u6b64\u53ef\u89c1\uff0c\u89c6\u56fe\u53ef\u4ee5\u7528\u6765\u63a7\u5236\u7528\u6237\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\uff0c\u5e76\u80fd\u7b80\u5316\u6570\u636e\u7684\u663e\u793a\uff0c\u5373\u901a\u8fc7\u89c6\u56fe\u53ea\u663e\u793a\u90a3\u4e9b\u9700\u8981\u7684\u6570\u636e\u4fe1\u606f\u3002<\/p>\n<pre><code class=\"language-sql line-numbers\">create or replace view view_test \nas \nselect teacher name , teacher_pass from teacher_table;\n<\/code><\/pre>\n<ol start=\"5\">\n<li>\u51fd\u6570\uff08Function\uff09<\/li>\n<\/ol>\n<p>\u7528\u4e8e\u5b8c\u6210\u4e00\u6b21\u7279\u5b9a\u7684\u8ba1\u7b97\uff0c\u5177\u6709\u4e00\u4e2a\u8fd4\u56de\u503c<\/p>\n<ul>\n<li>\u6570\u5b66\u51fd\u6570<\/p>\n<\/li>\n<li>\n<p>\u5b57\u7b26\u4e32\u51fd\u6570<\/p>\n<\/li>\n<li>\n<p>\u65e5\u671f\u548c\u65f6\u95f4\u51fd\u6570<\/p>\n<\/li>\n<\/ul>\n<p>writenoticeTime\u662f\u8981\u67e5\u65e5\u671f\u7684\u90a3\u4e2a\u5b57\u6bb5<br \/>\n<code>\u5206\u522b\u67e5\u770b\u4eca\u5929\u548c\u6628\u5929\u7684\u6570\u636e<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE TO_DAYS(writenoticeTime) = TO_DAYS(NOW());\nSELECT * FROM notice WHERE TO_DAYS( NOW( ) ) - TO_DAYS( writenoticeTime) = 1;\n<\/code><\/pre>\n<p><code>\u67e5\u770b\u8fd1\u4e00\u5468\u7684\u6570\u636e<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE DATE_SUB(CURDATE(), INTERVAL 7 DAY) &lt;= DATE(writenoticeTime);\nSELECT * FROM notice WHERE DATE_SUB(CURDATE(), INTERVAL 1 WEEK) &lt;= DATE(writenoticeTime);\n<\/code><\/pre>\n<p><code>\u67e5\u770b\u8fd1\u4e00\u6708\u7684\u6570\u636e<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE DATE_FORMAT( writenoticeTime, '%Y%m' ) = DATE_FORMAT( CURDATE( ) , '%Y%m' )\n<\/code><\/pre>\n<p><code>\u67e5\u4e0a\u4e2a\u6708\u7684\u6570\u636e<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE PERIOD_DIFF( DATE_FORMAT( NOW( ) , '%Y%m' ) , DATE_FORMAT( writenoticeTime, '%Y%m' ) ) =1\n<\/code><\/pre>\n<p><code>\u67e5\u8be2\u672c\u5b63\u5ea6<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE QUARTER(writenoticeTime)=QUARTER(NOW());\n<\/code><\/pre>\n<p><code>\u67e5\u8be2\u4eca\u5e74\u7684\u6570\u636e<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">SELECT * FROM notice WHERE YEAR(writenoticeTime)=YEAR(NOW());\n<\/code><\/pre>\n<p><code>\u65e5\u671f\u683c\u5f0f\u8f6c\u6362<\/code><\/p>\n<pre><code class=\"language-sql line-numbers\">#\u539f\u683c\u5f0f2021-03-01 13:54:00\u8f6c\u6362\u540e\u768420210301\nSELECT DATE_FORMAT(writenoticeTime,'%Y%m%d') FROM notice \n<\/code><\/pre>\n<ul>\n<li>\u6761\u4ef6\u5224\u65ad\u51fd\u6570<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">SELECT CASE BINARY 'b'\nWHEN 'a' THEN 1 WHEN 'b' THEN 2 END;\n#if\nSELECT IF(1&gt;2,2,3);\n\u5982\u679c\u5b57\u7b26\u4e32\u76f8\u540c\uff0cSTRCMP()\u8fd4\u56de0\uff0c\u5982\u679c\u7b2c\u4e00\u53c2\u6570\u6839\u636e\u5f53\u524d\u7684\u6392\u5e8f\u6b21\u5e8f\u5c0f\u4e8e\u7b2c\u4e8c\u4e2a\uff0c\u8fd4\u56de-1\uff0c\u5426\u5219\u8fd4\u56de1\u3002\nselect STRCMP('text', 'text2');\nselect STRCMP('text2', 'text');\nselect STRCMP('text', 'text');\n<\/code><\/pre>\n<ul>\n<li>\u7cfb\u7edf\u4fe1\u606f\u51fd\u6570<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">#\u67e5\u770b\u7248\u672c\nSELECT VERSION()\n<\/code><\/pre>\n<ul>\n<li>\u52a0\u5bc6\u51fd\u6570<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">SELECT PASSWORD('ssss');\n<\/code><\/pre>\n<ul>\n<li>\u683c\u5f0f\u5316\u51fd\u6570<\/li>\n<\/ul>\n<pre><code class=\"language-sql line-numbers\">FORMAT(x,n)\u51fd\u6570\u53ef\u4ee5\u5c06\u6570\u5b57x\u8fdb\u884c\u683c\u5f0f\u5316\uff0c\u5c06x\u4fdd\u7559\u5230\u5c0f\u6570\u70b9\u540en\u4f4d\nORMAT(2.356,2)\u8fd4\u56de\u7684\u7ed3\u679c\u5c06\u4f1a\u662f2.36\n<\/code><\/pre>\n<ol start=\"7\">\n<li>\u89e6\u53d1\u5668\uff08Trigger\uff09<\/li>\n<\/ol>\n<p>\u89e6\u53d1\u5668\u662f\u4e00\u4e2a\u7528\u6237\u5b9a\u4e49\u7684SQL\u4e8b\u52a1\u547d\u4ee4\u7684\u96c6\u5408\u3002\u5f53\u5bf9\u4e00\u4e2a\u8868\u8fdb\u884c\u63d2\u5165\u3001\u66f4\u6539\u3001\u5220\u9664\u65f6\uff0c\u8fd9\u7ec4\u547d\u4ee4\u5c31\u4f1a\u81ea\u52a8\u6267\u884c\u3002<\/p>\n<ol start=\"8\">\n<li>\u5b58\u50a8\u8fc7\u7a0b\uff08Stored Procedure\uff09<\/li>\n<\/ol>\n<p>\u5b58\u50a8\u8fc7\u7a0b\u662f\u4e3a\u5b8c\u6210\u7279\u5b9a\u7684\u529f\u80fd\u800c\u6c47\u96c6\u5728\u4e00\u8d77\u7684\u4e00\u7ec4SQL \u7a0b\u5e8f\u8bed\u53e5\uff0c\u7ecf\u7f16\u8bd1\u540e\u5b58\u50a8\u5728\u6570\u636e\u5e93\u4e2d\u7684SQL \u7a0b\u5e8f\u3002<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E4%B8%8EMySQL%E5%BB%BA%E7%AB%8B%E8%BF%9E%E6%8E%A5\"><\/span>\u4e0eMySQL\u5efa\u7acb\u8fde\u63a5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>1.\u4f7f\u7528Java API\u8fde\u63a5<\/p>\n<pre><code class=\"language-java line-numbers\">\/\/1.\u52a0\u8f7d\u6570\u636e\u5e93\u9a71\u52a8\u3002\u901a\u5e38\u4f7f Class \u7c7b\u7684 forNameO \u9759\u6001\u65b9\u6cd5\u6765\u52a0\u8f7d\u9a71\u52a8\nClass .forName(driverClass)\n\/\/2.\u901a\u8fc7 DriverManager \u83b7\u53d6\u6570\u636e\u5e93\u8fde\u63a5\nDriverManager .getConnection(String url , String user, String pass)\n\/\/3.\u901a\u8fc7 Connection \u5bf9\u8c61\u521b\u5efa Statement \u5bf9\u8c61\u3002\np=prepareStatement(String sql): \u6839\u636e\u4f20\u5165\u7684 SQL \u8bed\u53e5\u521b\u5efa\u9884\u7f16\u8bd1\u7684 Statement \u5bf9\u8c61\n\/\/4.\u4f7f\u7528 Statement \u6267\u884c SQL \u8bed\u53e5\np.executeUpdate()\u4e3b\u8981\u7528\u4e8e\u6267\u884c DML\u3001DDL\u8bed\u53e5\u3002\u6267\u884cDML\u8bed\u53e5\u8fd4\u56de\u53d7 SQL \u8bed\u53e5\u5f71\u54cd\u7684\u884c\u6570\uff0c\u6267\u884c DDL \u543e\u53e5\u8fd4\u56de0\u3002\n\/\/5.\u64cd\u4f5c\u7ed3\u679c\u96c6\u3002 \u5982\u679c\u6267\u884c\u7684 SQL \u8bed\u53e5\u662f\u67e5\u8be2\u8bed\u53e5\uff0c\u5219\u6267\u884c\u7ed3\u679c\u5c06\u8fd4\u56deResultSet \u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u91cc\u4fdd\u5b58\u4e86 SQL \u8bed\u53e5\u67e5\u8be2\u7684\u7ed3\u679c\u3002\u7a0b\u5e8f\u53ef\u4ee5\u901a\u8fc7\u64cd\u4f5c\u8be5 ResultSet \u8c61\u6765\u53d6\u51fa\u67e5\u8be2\u7ed3\u679c\u3002\n ResultSet rs =null;\n rs.next()\n\/\/6.\u56de\u6536\u6570\u636e\u5e93\u8d44\u6e90\uff0c\u5305\u62ec\u5173\u95ed ResultSet Statement Connection \u7b49\u8d44\u6e90\u3002\nrs.close();\np.close();\nconn.close();\n<\/code><\/pre>\n<blockquote><p>\n  mysql \u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u8fdb\u884c\u4e8c\u6b21\u67e5\u8be2\n<\/p><\/blockquote>\n<pre><code class=\"language-sql line-numbers\">SELECT SUM(a) FROM (SELECT COUNT(1)-1 AS a from shoppingmall.orders_ods_t GROUP by shipvia)  temp;\n<\/code><\/pre>\n<h1><span class=\"ez-toc-section\" id=\"%E6%A0%B8%E5%BF%83%E7%9A%84%E9%97%AE%E9%A2%98\"><\/span>\u6838\u5fc3\u7684\u95ee\u9898<span class=\"ez-toc-section-end\"><\/span><\/h1>\n<h2><span class=\"ez-toc-section\" id=\"Mysql%E4%B8%89%E5%A4%A7%E8%8C%83%E5%BC%8F\"><\/span>Mysql\u4e09\u5927\u8303\u5f0f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5efa\u7acb\u5197\u4f59\u8f83\u5c0f\u3001\u7ed3\u6784\u5408\u7406\u7684\u6570\u636e\u5e93<br \/>\n<strong>\u7b2c\u4e00\u8303\u5f0f\uff1a<\/strong>\u8981\u6c42\u6570\u636e\u5e93\u8868\u7684\u6bcf\u4e00\u5217\u90fd\u662f\u4e0d\u53ef\u5206\u5272\u7684\u57fa\u672c\u6570\u636e\u9879\uff0c\u540c\u4e00\u5217\u4e2d\u4e0d\u80fd\u6709\u591a\u4e2a\u503c\u3002\u6bd4\u5982\u67d0\u4e9b\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u9700\u8981\u7528\u5230\u201c\u5730\u5740\u201d\u8fd9\u4e2a\u5c5e\u6027\uff0c\u672c\u6765\u76f4\u63a5\u5c06\u201c\u5730\u5740\u201d\u5c5e\u6027\u8bbe\u8ba1\u6210\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u7684\u5b57\u6bb5\u5c31\u884c\u3002\u4f46\u662f\u5982\u679c\u7cfb\u7edf\u7ecf\u5e38\u4f1a\u8bbf\u95ee\u201c\u5730\u5740\u201d\u5c5e\u6027\u4e2d\u7684\u201c\u57ce\u5e02\u201d\u90e8\u5206\uff0c\u90a3\u4e48\u5c31\u975e\u8981\u5c06\u201c\u5730\u5740\u201d\u8fd9\u4e2a\u5c5e\u6027\u91cd\u65b0\u62c6\u5206\u4e3a\u7701\u4efd\u3001\u57ce\u5e02\u3001\u8be6\u7ec6\u5730\u5740\u7b49\u591a\u4e2a\u90e8\u5206\u8fdb\u884c\u5b58\u50a8\uff0c\u8fd9\u6837\u5728\u5bf9\u5730\u5740\u4e2d\u67d0\u4e00\u90e8\u5206\u64cd\u4f5c\u7684\u65f6\u5019\u5c06\u975e\u5e38\u65b9\u4fbf\u3002\u8fd9\u6837\u8bbe\u8ba1\u624d\u7b97\u6ee1\u8db3\u4e86\u6570\u636e\u5e93\u7684\u7b2c\u4e00\u8303\u5f0f<br \/>\n<strong>\u7b2c\u4e8c\u8303\u5f0f:<\/strong> \u8981\u6c42\u5b9e\u4f53\u4e2d\u6ca1\u4e00\u884c\u7684\u6240\u6709\u975e\u4e3b\u5c5e\u6027\u90fd\u5fc5\u987b\u5b8c\u5168\u4f9d\u8d56\u4e8e\u4e3b\u952e\uff1b\u5373\uff1a\u975e\u4e3b\u5c5e\u6027\u5fc5\u987b\u5b8c\u5168\u4f9d\u8d56\u4e8e\u4e3b\u952e\u3002\u5728\u4e00\u4e2a\u6570\u636e\u5e93\u8868\u4e2d\uff0c\u4e00\u4e2a\u8868\u4e2d\u53ea\u80fd\u4fdd\u5b58\u4e00\u79cd\u6570\u636e\uff0c\u4e0d\u53ef\u4ee5\u628a\u591a\u79cd\u6570\u636e\u4fdd\u5b58\u5728\u540c\u4e00\u5f20\u6570\u636e\u5e93\u8868\u4e2d<\/p>\n<table>\n<thead>\n<tr>\n<th>\u8ba2\u5355\u7f16\u53f7<\/th>\n<th>\u5546\u54c1\u7f16\u53f7<\/th>\n<th>\u5546\u54c1\u540d\u79f0<\/th>\n<th>\u6570\u91cf<\/th>\n<th>\u5355\u4f4d<\/th>\n<th>\u4ef7\u683c<\/th>\n<th>\u5ba2\u6237<\/th>\n<th>\u6240\u5c5e\u5355\u4f4d<\/th>\n<th>\u8054\u7cfb\u65b9\u5f0f<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>dd001<\/td>\n<td>001<\/td>\n<td>\u624b\u673a<\/td>\n<td>1<\/td>\n<td>\u4e2a<\/td>\n<td>3999<\/td>\n<td>\u5f20\u4e09<\/td>\n<td>\u6cf0\u56fd<\/td>\n<td>123456<\/td>\n<\/tr>\n<tr>\n<td>dd001<\/td>\n<td>002<\/td>\n<td>\u7535\u8111<\/td>\n<td>2<\/td>\n<td>\u53f0<\/td>\n<td>4999<\/td>\n<td>\u674e\u56db<\/td>\n<td>\u65b0\u52a0\u5761<\/td>\n<td>321457<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5546\u54c1\u4fe1\u606f\u8868<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"center\">\u5546\u54c1\u7f16\u53f7<\/th>\n<th align=\"center\">\u5546\u54c1\u540d\u79f0<\/th>\n<th align=\"center\">\u5355\u4f4d<\/th>\n<th align=\"center\">\u4ef7\u683c<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">001<\/td>\n<td align=\"center\">\u624b\u673a<\/td>\n<td align=\"center\">\u4e2a<\/td>\n<td align=\"center\">3999<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">002<\/td>\n<td align=\"center\">\u7535\u8111<\/td>\n<td align=\"center\">\u53f0<\/td>\n<td align=\"center\">4999<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8ba2\u5355\u8868<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"center\">\u8ba2\u5355\u7f16\u53f7<\/th>\n<th align=\"center\">\u5546\u54c1\u7f16\u53f7<\/th>\n<th align=\"center\">\u6570\u91cf<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\">dd001<\/td>\n<td align=\"center\">001<\/td>\n<td align=\"center\">1<\/td>\n<\/tr>\n<tr>\n<td align=\"center\">dd002<\/td>\n<td align=\"center\">002<\/td>\n<td align=\"center\">2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u7b2c\u4e09\u8303\u5f0f\uff1a<\/strong>\u4e09\u8303\u5f0f\u8981\u6c42\uff1a\u5b9e\u4f53\u4e2d\u7684\u5c5e\u6027\u4e0d\u80fd\u662f\u5176\u4ed6\u5b9e\u4f53\u4e2d\u7684\u975e\u4e3b\u5c5e\u6027\u3002\u56e0\u4e3a\u8fd9\u6837\u4f1a\u51fa\u73b0\u5197\u4f59\u3002\u5373\uff1a\u5c5e\u6027\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u975e\u4e3b\u5c5e\u6027<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E6%95%B0%E6%8D%AE%E5%BA%93%E4%BA%8B%E7%89%A9\"><\/span>\u6570\u636e\u5e93\u4e8b\u7269<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5b9a\u4e49:\u6570\u636e\u5e93\u4e8b\u52a1\u662f\u6784\u6210\u5355\u4e00\u903b\u8f91\u5de5\u4f5c\u5355\u5143\u7684\u64cd\u4f5c\u96c6\u5408<br \/>\n\u4e8b\u52a1\u5c31\u662f\u5c06\u4e00\u7ec4SQL\u8bed\u53e5\u653e\u5728\u540c\u4e00\u6279\u6b21\u5185\u53bb\u6267\u884c<br \/>\n&#8211; \u9694\u79bb\u7ea7\u522b<br \/>\n\u4e8b\u52a1\u5177\u6709\u9694\u79bb\u6027,\u7406\u8bba\u4e0a\u6765\u8bf4\u4e8b\u52a1\u4e4b\u95f4\u7684\u6267\u884c\u4e0d\u5e94\u8be5\u76f8\u4e92\u4ea7\u751f\u5f71\u54cd,\u5176\u5bf9\u6570\u636e\u5e93\u7684\u5f71\u54cd\u5e94\u8be5\u548c\u5b83\u4eec\u4e32\u884c\u6267\u884c\u65f6\u4e00\u6837\u3002<br \/>\n\u7136\u800c\u5b8c\u5168\u7684\u9694\u79bb\u6027\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u5e76\u53d1\u6027\u80fd\u5f88\u4f4e,\u964d\u4f4e\u5bf9\u8d44\u6e90\u7684\u5229\u7528\u7387,\u56e0\u800c\u5b9e\u9645\u4e0a\u5bf9\u9694\u79bb\u6027\u7684\u8981\u6c42\u4f1a\u6709\u6240\u653e\u5bbd,\u8fd9\u4e5f\u4f1a\u4e00\u5b9a\u7a0b\u5ea6\u9020\u6210\u5bf9\u6570\u636e\u5e93\u4e00\u81f4\u6027\u8981\u6c42\u964d\u4f4e<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E6%95%B0%E6%8D%AE%E5%BA%93%E5%B8%B8%E8%A7%81%E7%9A%84%E5%B9%B6%E5%8F%91%E5%BC%82%E5%B8%B8%E3%80%82\"><\/span>\u6570\u636e\u5e93\u5e38\u89c1\u7684\u5e76\u53d1\u5f02\u5e38\u3002<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>\u810f\u5199<\/li>\n<\/ul>\n<p>\u810f\u5199\u662f\u6307\u4e8b\u52a1\u56de\u6eda\u4e86\u5176\u4ed6\u4e8b\u52a1\u5bf9\u6570\u636e\u9879\u7684\u5df2\u63d0\u4ea4\u4fee\u6539,<br \/>\n&#8211; \u810f\u8bfb<\/p>\n<p>\u810f\u8bfb\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u4e86\u53e6\u4e00\u4e2a\u4e8b\u52a1\u672a\u63d0\u4ea4\u7684\u6570\u636e<br \/>\n&#8211; \u5e7b\u8bfb<\/p>\n<p>\u5e7b\u8bfb\u662f\u6307\u4e8b\u52a1\u8bfb\u53d6\u67d0\u4e2a\u8303\u56f4\u7684\u6570\u636e\u65f6\uff0c\u56e0\u4e3a\u5176\u4ed6\u4e8b\u52a1\u7684\u64cd\u4f5c\u5bfc\u81f4\u524d\u540e\u4e24\u6b21\u8bfb\u53d6\u7684\u7ed3\u679c\u4e0d\u4e00\u81f4\u3002\u5e7b\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u533a\u522b\u5728\u4e8e,\u4e0d\u53ef\u91cd\u590d\u8bfb\u662f\u9488\u5bf9\u786e\u5b9a\u7684\u67d0\u4e00\u884c\u6570\u636e\u800c\u8a00,\u800c\u5e7b\u8bfb\u662f\u9488\u5bf9\u4e0d\u786e\u5b9a\u7684\u591a\u884c\u6570\u636e\u3002\u56e0\u800c\u5e7b\u8bfb\u901a\u5e38\u51fa\u73b0\u5728\u5e26\u6709\u67e5\u8be2\u6761\u4ef6\u7684\u8303\u56f4\u67e5\u8be2\u4e2d.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u662f\u4ec0\u4e48 MySQL \u662f\u4e00\u4e2a\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\uff0c\u7531\u745e\u5178 MySQL AB \u516c\u53f8\u5f00\u53d1\uff0c\u76ee\u524d\u5c5e\u4e8e Oracle 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