{"id":53,"date":"2021-03-13T12:14:52","date_gmt":"2021-03-13T04:14:52","guid":{"rendered":"http:\/\/daishen.ltd\/?p=53"},"modified":"2021-03-13T12:14:53","modified_gmt":"2021-03-13T04:14:53","slug":"mysql%e5%86%85%e7%bd%ae%e7%9a%84%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.daishen.ltd\/?p=53","title":{"rendered":"mysql\u5185\u7f6e\u7684\u529f\u80fd"},"content":{"rendered":"<p><meta charset=\"UTF-8\"><meta name=\"viewport\" content=\"width=device-width initial-scale=1\"><br \/>\n<title>mysql\u5185\u7f6e\u7684\u529f\u80fd<\/title><\/p>\n<h1>mysql\u5185\u7f6e\u7684\u529f\u80fd<\/h1>\n<p>-u   \u6307\u5b9a\u7528\u6237\u540d<br \/>\n-p   \u6307\u5b9a\u5bc6\u7801<br \/>\n-S   \u6307\u5b9asock\u6587\u4ef6<br \/>\n-h   \u6307\u5b9aip\u5730\u5740<br \/>\n-P   \u6307\u5b9a\u7aef\u53e3<br \/>\n-e   \u9762\u4ea4\u4e92\u76f4\u63a5\u6267\u884cSQL\u8bed\u53e5<\/p>\n<p>&lt;    \u5bfc\u5165SQL\u6587\u4ef6<\/p>\n<p>\u4f8b\u5b50<\/p>\n<pre><code class=\"language-shell\" lang=\"shell\">1.mysql -uroot -p -S \/tmp\/mysql.sock\n2.mysql -uroot -p -h10.0.0.51 -P3306\n3.mysql -uroot -p -e \"show databeses;\"\n4.mysql -uroot -p1 &lt; \/root\/ocp.sql\n<\/code><\/pre>\n<h4>\u5185\u7f6e\u547d\u4ee4<\/h4>\n<pre><code>help  \t\t\t\t\t\t\u6253\u5370mysql\u5e2e\u52a9\n\\c    Ctrl+d    \t\t\t\u7ed3\u675f\u4e0a\u4e2a\u547d\u4ee4\u8fd0\u884c\n\\q  quit;  exit;  Ctrl+d    \u9000\u51famysql  \n\\G\t\t\t\t\t\t\t\u5c06\u6570\u636e\u7ad6\u8d77\u6765\u663e\u793a\nsource\t\t\t\t\t\t\u6062\u590d\u5907\u4efd\u6587\u4ef6\n\n<\/code><\/pre>\n<h1>sql\u57fa\u7840\u5e94\u7528<\/h1>\n<h2>sql\u4ecb\u7ecd<\/h2>\n<p>\u7ed3\u6784\u5316\u7684\u67e5\u8be2\u8bed\u8a00<br \/>\n\u5173\u7cfb\u578b\u6570\u636e\u5e93\u901a\u7528\u7684\u547d\u4ee4<br \/>\n\u9075\u5faaSQL92\u7684\u6807\u51c6(SQL_MODE)<\/p>\n<h2>SQL\u5e38\u7528\u79cd\u7c7b<\/h2>\n<p>DDL\t\u6570\u636e\u5b9a\u4e49\u8bed\u8a00<br \/>\nDCL\t\u6570\u636e\u63a7\u5236\u8bed\u8a00<br \/>\nDML\t\u6570\u636e\u64cd\u4f5c\u8bed\u8a00<br \/>\nDQL\t\u6570\u636e\u67e5\u8be2\u8bed\u8a00<\/p>\n<h2>SQL\u5f15\u5165-\u6570\u636e\u5e93\u7684\u903b\u8f91\u7ed3\u6784<\/h2>\n<p>\u5e93<br \/>\n\u200b\t\t\u5e93\u540d\u5b57<br \/>\n\u200b\t\t\u5e93\u5c5e\u6027\uff1a\u5b57\u7b26\u96c6\uff0c\u6392\u5e8f\u89c4\u5219<\/p>\n<p>\u8868<br \/>\n\u200b\t\t\u8868\u540d<br \/>\n\u200b\t\t\u8868\u5c5e\u6027\uff1a\u5b58\u50a8\u5f15\u64ce\u7c7b\u578b\uff0c\u5b57\u7b26\u96c6\uff0c\u6392\u5e8f\u89c4\u5219<br \/>\n\u200b\t\t\u5217\u540d<br \/>\n\u200b\t\t\u5217\u5c5e\u6027\uff1a\u6570\u636e\u7c7b\u578b\uff0c\u7ea6\u675f\uff0c\u5176\u4ed6\u5c5e\u6027<br \/>\n\u200b\t\t\u6570\u636e\u884c<\/p>\n<h3>\u5b57\u7b26\u96c6\uff08charset\uff09<\/h3>\n<p>\u76f8\u5f53\u4e8emysql\u7684\u5bc6\u7801\u672c\uff08\u7f16\u7801\u8868\uff09<br \/>\nshow charset;\t\t\t\t\u67e5\u770b\u652f\u6301\u7684\u5b57\u7b26\u7c7b\u578b<\/p>\n<p>utf8\t\t\t\t\t\t\t\t\uff1a3\u4e2a\u5b57\u8282<br \/>\nutf8mb4\uff08\u5efa\u8bae\u4f7f\u7528\uff09 \uff1a4\u4e2a\u5b57\u8282\uff0c\u652f\u6301emoji<\/p>\n<h4>\u6392\u5e8f\u89c4\u5219\uff08collation\uff09<\/h4>\n<p>\u5bf9\u4e8e\u82f1\u6587\u5b57\u7b26\u4e32\u7684\uff0c\u5927\u5c0f\u5199\u7684\u654f\u611f<\/p>\n<p>utf8mb4_generalci\t\t\t\u5927\u5c0f\u5199\u4e0d\u654f\u611f<br \/>\nutf8mb4_bin\t\t\t\t\t   \u5927\u5c0f\u5199\u654f\u611f\uff08\u62fc\u97f3\uff0c\u65e5\u6587\uff09<\/p>\n<h4>\u6570\u636e\u7c7b\u578b<\/h4>\n<h5>\u6570\u5b57<\/h5>\n<figure>\n<table>\n<thead>\n<tr>\n<th>\u7c7b<\/th>\n<th>\u7c7b\u578b<\/th>\n<th>\u8bf4\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>TINYINT<\/td>\n<td>\u6781\u5c0f\u6574\u6570\u6570\u636e\u7c7b\u578b(0-255)<\/td>\n<\/tr>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>SMALLINT<\/td>\n<td>\u8f83\u5c0f\u6574\u6570\u6570\u636e\u7c7b\u578b(-2^15 \u52302^15-1 )<\/td>\n<\/tr>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>MEDIUMINT<\/td>\n<td>\u4e2d\u578b\u6574\u6570\u6570\u636e\u7c7b\u578b<\/td>\n<\/tr>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>INT<\/td>\n<td>\u5e38\u89c4(\u5e73\u5747)\u5927\u5c0f\u7684\u6574\u6570\u6570\u636e\u7c7b\u578b(-2^31 \u52302^31-1)<\/td>\n<\/tr>\n<tr>\n<td>\u6574\u6570<\/td>\n<td>BIGINT<\/td>\n<td>\u8f83\u5927\u6574\u6570\u6570\u636e\u7c7b\u578b(-2 63\u52302^63-1 )<\/td>\n<\/tr>\n<tr>\n<td>\u6d6e\u70b9\u6570<\/td>\n<td>FLOAT<\/td>\n<td>\u5c0f\u578b\u5355\u7cbe\u5ea6(\u56db\u4e2a\u5b57\u8282)\u6d6e\u70b9\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u6d6e\u70b9\u6570<\/td>\n<td>DOUBLE<\/td>\n<td>\u5e38\u89c4\u53cc\u7cbe\u5ea6(\u516b\u4e2a\u5b57\u8282)\u6d6e\u70b9\u6570<\/td>\n<\/tr>\n<tr>\n<td>\u5b9a\u70b9\u6570<\/td>\n<td>DECIMAL<\/td>\n<td>\u5305\u542b\u6574\u6570\u90e8\u5206\u3001\u5c0f\u6570\u90e8\u5206\u6216\u540c\u65f6\u5305\u62ec\u4e8c\u8005\u7684\u7cbe\u786e\u503c\u6570\u503c<\/td>\n<\/tr>\n<tr>\n<td>BIT<\/td>\n<td>BIT<\/td>\n<td>\u4f4d\u5b57\u6bb5\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h5>\u5b57\u7b26\u4e32<\/h5>\n<figure>\n<table>\n<thead>\n<tr>\n<th style=\"text-align:left;\">\u7c7b\u578b<\/th>\n<th style=\"text-align:left;\">\u5927\u5c0f<\/th>\n<th style=\"text-align:left;\">\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">CHAR<\/td>\n<td style=\"text-align:left;\">0-255 bytes<\/td>\n<td style=\"text-align:left;\">\u5b9a\u957f\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">VARCHAR<\/td>\n<td style=\"text-align:left;\">0-65535 bytes<\/td>\n<td style=\"text-align:left;\">\u53d8\u957f\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">TINYBLOB<\/td>\n<td style=\"text-align:left;\">0-255 bytes<\/td>\n<td style=\"text-align:left;\">\u4e0d\u8d85\u8fc7 255 \u4e2a\u5b57\u7b26\u7684\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">TINYTEXT<\/td>\n<td style=\"text-align:left;\">0-255 bytes<\/td>\n<td style=\"text-align:left;\">\u77ed\u6587\u672c\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">BLOB<\/td>\n<td style=\"text-align:left;\">0-65 535 bytes<\/td>\n<td style=\"text-align:left;\">\u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u957f\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">TEXT<\/td>\n<td style=\"text-align:left;\">0-65 535 bytes<\/td>\n<td style=\"text-align:left;\">\u957f\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">MEDIUMBLOB<\/td>\n<td style=\"text-align:left;\">0-16 777 215 bytes<\/td>\n<td style=\"text-align:left;\">\u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u4e2d\u7b49\u957f\u5ea6\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">MEDIUMTEXT<\/td>\n<td style=\"text-align:left;\">0-16 777 215 bytes<\/td>\n<td style=\"text-align:left;\">\u4e2d\u7b49\u957f\u5ea6\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">LONGBLOB<\/td>\n<td style=\"text-align:left;\">0-4 294 967 295 bytes<\/td>\n<td style=\"text-align:left;\">\u4e8c\u8fdb\u5236\u5f62\u5f0f\u7684\u6781\u5927\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">LONGTEXT<\/td>\n<td style=\"text-align:left;\">0-4 294 967 295 bytes<\/td>\n<td style=\"text-align:left;\">\u6781\u5927\u6587\u672c\u6570\u636e<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h5>\u65f6\u95f4<\/h5>\n<figure>\n<table>\n<thead>\n<tr>\n<th style=\"text-align:left;\">\u7c7b\u578b<\/th>\n<th style=\"text-align:left;\">\u5927\u5c0f ( bytes)<\/th>\n<th style=\"text-align:left;\">\u8303\u56f4<\/th>\n<th style=\"text-align:left;\">\u683c\u5f0f<\/th>\n<th style=\"text-align:left;\">\u7528\u9014<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align:left;\">DATE<\/td>\n<td style=\"text-align:left;\">3<\/td>\n<td style=\"text-align:left;\">1000-01-01\/9999-12-31<\/td>\n<td style=\"text-align:left;\">YYYY-MM-DD<\/td>\n<td style=\"text-align:left;\">\u65e5\u671f\u503c<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">TIME<\/td>\n<td style=\"text-align:left;\">3<\/td>\n<td style=\"text-align:left;\">&#8216;-838:59:59&#8217;\/&#8217;838:59:59&#8217;<\/td>\n<td style=\"text-align:left;\">HH:MM:SS<\/td>\n<td style=\"text-align:left;\">\u65f6\u95f4\u503c\u6216\u6301\u7eed\u65f6\u95f4<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">YEAR<\/td>\n<td style=\"text-align:left;\">1<\/td>\n<td style=\"text-align:left;\">1901\/2155<\/td>\n<td style=\"text-align:left;\">YYYY<\/td>\n<td style=\"text-align:left;\">\u5e74\u4efd\u503c<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">DATETIME<\/td>\n<td style=\"text-align:left;\">8<\/td>\n<td style=\"text-align:left;\">1000-01-01 00:00:00\/9999-12-31 23:59:59<\/td>\n<td style=\"text-align:left;\">YYYY-MM-DD HH:MM:SS<\/td>\n<td style=\"text-align:left;\">\u6df7\u5408\u65e5\u671f\u548c\u65f6\u95f4\u503c<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align:left;\">TIMESTAMP<\/td>\n<td style=\"text-align:left;\">4<\/td>\n<td style=\"text-align:left;\">1970-01-01 00:00:00\/2038\u7ed3\u675f\u65f6\u95f4\u662f\u7b2c <strong>2147483647<\/strong> \u79d2\uff0c\u5317\u4eac\u65f6\u95f4 <strong>2038-1-19 11:14:07<\/strong>\uff0c\u683c\u6797\u5c3c\u6cbb\u65f6\u95f4 2038\u5e741\u670819\u65e5 \u51cc\u6668 03:14:07<\/td>\n<td style=\"text-align:left;\">YYYYMMDD HHMMSS<\/td>\n<td style=\"text-align:left;\">\u6df7\u5408\u65e5\u671f\u548c\u65f6\u95f4\u503c\uff0c\u65f6\u95f4\u6233<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<h5>\u4e8c\u8fdb\u5236<\/h5>\n<h2>DDL\u7684\u5e94\u7528<\/h2>\n<h4>DDL\u8bed\u53e5\u5e93\u7684\u5b9a\u4e49<\/h4>\n<p>\u521b\u5efa\u5e93<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">create database zabbix charset utf8mb4 collate utf8mb4_bin;\n\nshow databases;              \t\u67e5\u770b\u5e93\u60c5\u51b5\nshow create database zabbix;    \u67e5\u770b\u5e93\u60c5\u51b5\n<\/code><\/pre>\n<p>\u5220\u9664\u5e93<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">drop database zabbix;\n<\/code><\/pre>\n<p>\u4fee\u6539\u6570\u636e\u5e93\u5b57\u7b26\u96c6<\/p>\n<p>\u6ce8\u610f\uff1a\u4e00\u5b9a\u662f\u4ece\u5c0f\u5f80\u5927\u4e86\u6539\uff0c\u6bd4\u5982utf8&#8212;&gt;utf8mb4<\/p>\n<p>\u76ee\u6807\u7684\u5b57\u7b26\u96c6\u4e00\u5b9a\u662f\u539f\u5b57\u7b26\u96c6\u7684\u8d85\u7ea7<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">alter database zabbix charset utf8mb4;\n<\/code><\/pre>\n<h4>\u5e93\u7684\u5b9a\u4e49\u89c4\u8303<\/h4>\n<p>\u5efa\u5e93\u540d\u79f0\u4f7f\u7528\u5c0f\u5199<\/p>\n<p>\u5e93\u540d\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934<\/p>\n<p>\u4e0d\u80fd\u662f\u6570\u636e\u5e93\u5185\u90e8\u7684\u5173\u952e\u5b57<\/p>\n<p>\u5efa\u5e93\u5fc5\u987b\u8bbe\u7f6e\u5b57\u7b26\u96c6<\/p>\n<h4>DDL\u8868\u89c4\u8303<\/h4>\n<p>\u5efa\u8868<\/p>\n<p>\u8868\u540d\uff0c\u5217\u540d\uff0c\u5217\u5c5e\u6027\uff0c\u8868\u5c5e\u6027<\/p>\n<pre><code>\u5efa\u8868\u89c4\u8303\uff1a\n1.\u8868\u540d\u5c0f\u5199\u5b57\u6bcd\uff0c\u4e0d\u80fd\u6570\u5b57\u5f00\u5934\uff0c\n2.\u4e0d\u80fd\u662f\u4fdd\u7559\u5b57\u7b26,\u4f7f\u7528\u548c\u4e1a\u52a1\u6709\u5173\u7684\u8868\u540d\n3.\u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7c7b\u578b\u53ca\u957f\u5ea6\n4.\u6bcf\u4e2a\u5217\u8bbe\u7f6eNOT NULL + DEFAULT .\u5bf9\u4e8e\u6570\u636e0\u586b\u5145,\u5bf9\u4e8e\u5b57\u7b26\u4f7f\u7528\u6709\u6548\u5b87\n5.\u6ca1\u4e2a\u5217\u8bbe\u7f6e\u6ce8\u91ca\n6.\u8868\u5fc5\u987b\u8bbe\u7f6e\u5b58\u50a8\u5f15\u64ce\u548c\u5b57\u7b26\u96c6\n7.\u4e3b\u952e\u5217\u5c3d\u91cf\u662f\u65e0\u5173\u5217\uff0c\u6700\u597d\u662f\u81ea\u589e\u957f\n9.enum\u7c7b\u578b\u4e0d\u8981\u4fdd\u5b58\u6570\u5b57\uff0c\u53ea\u80fd\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<pre><code>\u5217\u5c5e\u6027\uff1a\n\n\u200b\t\t\tPRIMARY KEY\uff1a\u4e3b\u952e\u7ea6\u675f\n\u200b\t\t\tNOT NULL\uff1a\u975e\u7a7a\u7ea6\u675f\uff0c\u4e0d\u5141\u8bb8\u63a7\u5236\n\u200b\t\t\tUNIQE KEY\uff1a\u552f\u4e00\u952e\u7ea6\u675f\uff0c\u4e0d\u5141\u8bb8\u91cd\u590d\u503c\n\u200b\t\t\tDEFAULT\uff1a\u4e00\u822c\u914d\u5408NOT NULL\u4f7f\u7528\n\u200b\t\t\tUNSIGNED\uff1a\u65e0\u7b26\u53f7\uff0c\u4e00\u822c\u914d\u5408\u6570\u5b57\u5217\uff0c\u975e\u8d1f\u6570\n\u200b\t\t\tCOMMENT\uff1a\u6ce8\u91ca\n\u200b\t\t\tAUTO_INCREMENT\uff1a\u81ea\u589e\u957f\u7684\u5217\n<\/code><\/pre>\n<pre><code class=\"language-mysql\" lang=\"mysql\">CREATE TABLE stu (\nid INT PRIMARY KEY NOT NULL AUTO INCREMENT COMMENT '\u5b66\u53f7',\nsname VARCHAR (255) NOT NULL COMMENT '\u59d3\u540d'\uff0c\nage TINYINT UNSIGNED NOT NULL DEFAULT 0 COMMENT '\u5e74\u9f84',\ngender ENUM( 'm', 'f', 'n') NOT NULL DEFAULT 'n' COMMENT '\u6027\u522b\"\uff0c\nintime DATETIME NOT NULL DEFAULT NOW() COMMENT '\u5165\u5b66\u65f6\u95f4'\n) ENGINE INNODB CHARSET utf8mb4;\n<\/code><\/pre>\n<p>\u67e5\u8be2\u5efa\u8868\u4fe1\u606f<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SHOW TABLES;\nSHOW CREATE TABLE stu;\nCREATE TABLE test LIKE stu;       \u521b\u5efa\u4e00\u4e2a\u8868\u7ed3\u6784\u4e00\u6837\u7684\u8868\n<\/code><\/pre>\n<p>\u5220\u8868<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">DROP TABLE test;\n<\/code><\/pre>\n<p>\u4fee\u6539<\/p>\n<p>\u5728stu\u8868\u4e2d\u6dfb\u52a0qq\u5217<\/p>\n<pre><code class=\"language-php\" lang=\"php\">DESC stu;\nALTER TABLE stu ADD qq VARCHAR(20) NOT NULL UNIQUE COMMENT 'qq\u53f7';\n<\/code><\/pre>\n<p>\u5728sname\u540e\u52a0\u5fae\u4fe1\u5217<\/p>\n<pre><code class=\"language-php\" lang=\"php\">ALTER TABLE stu ADD wechat VARCHAR(64) NOT NULL UNIQUE  COMMENT '\u5fae\u4fe1\u53f7' AFTER sname ;\n<\/code><\/pre>\n<p>\u5728id\u5217\u524d\u52a0\u4e00\u4e2a\u65b0\u5217num<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">ALTER TABLE stu ADD num INT NOT NULL COMMENT '\u6570\u5b57' FIRST;\nDESC stu;\n<\/code><\/pre>\n<p>\u628a\u521a\u624d\u6dfb\u52a0\u7684\u5217\u90fd\u5220\u6389(\u5371\u9669)<\/p>\n<pre><code class=\"language-dart\" lang=\"dart\">ALTER TABLE stu DROP num;\nALTER TABLE stu DROP qq;\nALTER TABLE stu DROP wechat;\n<\/code><\/pre>\n<p>\u4fee\u6539sname\u6570\u636e\u7c7b\u578b\u7684\u5c5e\u6027<\/p>\n<pre><code class=\"language-cpp\" lang=\"cpp\">ALTER TABLE stu MODIFY sname VARCHAR(128)  NOT NULL ;\n<\/code><\/pre>\n<p>\u5c06sgender \u6539\u4e3a sg  \u6570\u636e\u7c7b\u578b\u6539\u4e3a CHAR \u7c7b\u578b<\/p>\n<pre><code class=\"language-php\" lang=\"php\">ALTER TABLE stu CHANGE sgender sg CHAR(1) NOT NULL DEFAULT 'n' ;\nDESC stu;\n<\/code><\/pre>\n<h4>\u8868\u5c5e\u6027\u67e5\u8be2\uff08DQL\uff09<\/h4>\n<pre><code class=\"language-dart\" lang=\"dart\">use school\nshow tables\uff1b\ndesc stu;\nshow create table stu\uff1b\nCREATE TABLE ceshi LIKE stu;\n<\/code><\/pre>\n<h2>DCL\u5e94\u7528<\/h2>\n<pre><code class=\"language-shell\" lang=\"shell\">grant \nrevoke\n<\/code><\/pre>\n<h2>DML\u5e94\u7528<\/h2>\n<h5>\u4f5c\u7528<\/h5>\n<pre><code class=\"language-undefined\" lang=\"undefined\">\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u884c\u8fdb\u884c\u589e\u3001\u5220\u3001\u6539\n<\/code><\/pre>\n<h4>insert<\/h4>\n<pre><code class=\"language-csharp\" lang=\"csharp\">--- \u6700\u6807\u51c6\u7684insert\u8bed\u53e5\nINSERT INTO stu(id,sname,sage,sg,sfz,intime) \nVALUES\n(1,'zs',18,'m','123456',NOW());\nSELECT * FROM stu;\n\n--- \u7701\u4e8b\u7684\u5199\u6cd5\nINSERT INTO stu \nVALUES\n(2,'ls',18,'m','1234567',NOW());\n\n--- \u9488\u5bf9\u6027\u7684\u5f55\u5165\u6570\u636e\nINSERT INTO stu(sname,sfz)\nVALUES ('w5','34445788');\n\n--- \u540c\u65f6\u5f55\u5165\u591a\u884c\u6570\u636e\nINSERT INTO stu(sname,sfz)\nVALUES \n('w55','3444578d8'),\n('m6','1212313'),\n('aa','123213123123');\n\nSELECT * FROM stu;\n<\/code><\/pre>\n<h4>update<\/h4>\n<pre><code class=\"language-shell\" lang=\"shell\">DESC stu;\nSELECT * FROM stu;\nUPDATE stu SET sname='zhao4' WHERE id=2;\n\u6ce8\u610f\uff1aupdate\u8bed\u53e5\u5fc5\u987b\u8981\u52a0where\u3002\n<\/code><\/pre>\n<h4>delete\uff08\u5371\u9669\uff01\uff01\uff09<\/h4>\n<pre><code class=\"language-objectivec\" lang=\"objectivec\">DELETE FROM stu  WHERE id=3;\n<\/code><\/pre>\n<p>\u5168\u8868\u5220\u9664:<\/p>\n<pre><code class=\"language-cpp\" lang=\"cpp\">DELETE FROM stu\ntruncate table stu;\n\u533a\u522b:\ndelete: DML\u64cd\u4f5c, \u662f\u903b\u8f91\u6027\u8d28\u5220\u9664,\u9010\u884c\u8fdb\u884c\u5220\u9664,\u901f\u5ea6\u6162.\ntruncate: DDL\u64cd\u4f5c,\u5bf9\u4e0e\u8868\u6bb5\u4e2d\u7684\u6570\u636e\u9875\u8fdb\u884c\u6e05\u7a7a,\u901f\u5ea6\u5feb.\n<\/code><\/pre>\n<p>\u4f2a\u5220\u9664\uff1a\u7528update\u6765\u66ff\u4ee3delete\uff0c\u6700\u7ec8\u4fdd\u8bc1\u4e1a\u52a1\u4e2d\u67e5\u4e0d\u5230\uff08select\uff09\u5373\u53ef<\/p>\n<pre><code class=\"language-objectivec\" lang=\"objectivec\">1.\u6dfb\u52a0\u72b6\u6001\u5217\nALTER TABLE stu ADD state TINYINT NOT NULL DEFAULT 1 ;\nSELECT * FROM stu;\n\n2. UPDATE \u66ff\u4ee3 DELETE\nUPDATE stu SET state=0 WHERE id=6;\n\n3. \u4e1a\u52a1\u8bed\u53e5\u67e5\u8be2\nSELECT * FROM stu WHERE state=1;\n<\/code><\/pre>\n<h2>DQL\u4ecb\u7ecd<\/h2>\n<p>select<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">select \u5217\nfrom \u8868\nwhere  \u6761\u4ef6\ngroup  \u6761\u4ef6\nhaving  \u6761\u4ef6\norder by \u6761\u4ef6\nlimit\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<h2>\u6269\u5c55\u7c7b\u5185\u5bb9-\u5143\u6570\u636e\u83b7\u53d6<\/h2>\n<h4>\u5143\u6570\u636e\u4ecb\u7ecd\u53ca\u83b7\u53d6\u4ecb\u7ecd<\/h4>\n<p>\u5143\u6570\u636e\u5b58\u50a8\u5728\u201c\u57fa\u8868\u201d\u4e2d\u3002<br \/>\n\u901a\u8fc7\u4e13\u7528DDL\u8bed\u53e5\uff0cDCL\u8bed\u53e5\u8fdb\u884c\u4fee\u6539<br \/>\n\u901a\u8fc7\u4e13\u7528\u89c6\u56fe\u548c\u547d\u4ee4\u8fdb\u884c\u5143\u6570\u636e\u67e5\u8be2<br \/>\ninformation_schema\u4e2d\u4fdd\u5b58\u4e86\u5927\u91cf\u5143\u6570\u636e\u67e5\u8be2\u7684\u8bd5\u56fe<br \/>\nshow\u547d\u4ee4\u662f\u5c01\u88c5\u597d\u529f\u80fd\uff0c\u63d0\u4f9b\u57fa\u7840\u5143\u6570\u636e\u67e5\u8be2<\/p>\n<h4>information_schema\u7684\u57fa\u672c\u5e94\u7528<\/h4>\n<h5>tables\u89c6\u56fe\u7684\u5e94\u7528<\/h5>\n<pre><code class=\"language-mysql\" lang=\"mysql\">use in formation_ schema ;\ndesc tables ;\n\nTABLE_SCHEMA\t\t\u8868\u6240\u5728\u7684\u5e93\u540d\nTABLE_NAME\t\t\t\u8868\u540d\nENGINE\t\t\t\t\u5b58\u50a8\u5f15\u64ce\nTABLE_ROWS\t\t\t\u6570\u636e\u884c\nAVG_ROW_LENGTH\t\t\u5e73\u5747\u884c\u957f\u5ea6\nINDEX_LENGTH\t\t\u7d22\u5f15\u957f\u5ea6\n<\/code><\/pre>\n<p>\u4f8b\u5b50\uff1a<\/p>\n<p>1.\u663e\u793a\u6240\u6709\u7684\u5e93\u548c\u8868\u7684\u4fe1\u606f<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table schema, table_name FROM in formation_schema.tables;\n<\/code><\/pre>\n<p>2.\u4ee5\u4ee5\u4e0b\u6a21\u5f0f\u663e\u793a\u6240\u6709\u7684\u5e93\u548c\u8868\u7684\u4fe1\u606f<br \/>\nworld\uff1acity , country , countrylanguage<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table_schema,GROUP_CONCAT(table_name)\nFROM information_schema.tables\nGROUP BY table_schema ;\n<\/code><\/pre>\n<p>3.\u67e5\u8be2\u6240\u6709innodb\u5f15\u64ce\u7684\u8868<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table_schema,table_name,ENGINE\nFROM information_schema.tables\nWHERE ENGINE='innodb';\n<\/code><\/pre>\n<p>4.\u7edf\u8ba1world\u4e0b\u7684city\u8868\u5360\u7528\u7a7a\u95f4\u5927\u5c0f<br \/>\n\u8868\u7684\u6570\u636e\u91cf=\u5e73\u5747\u884c\u957f\u5ea6*\u884c\u6570+\u7d22\u5f15\u957f\u5ea6<\/p>\n<p>AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table_name,(AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH)\/1024\nFROM information_schema.TABLES\nWHERE table_schema='ocp' AND table_name= 'products';\n<\/code><\/pre>\n<p>5.\u7edf\u8ba1world\u5e93\u6570\u636e\u91cf\u603b\u5927\u5c0f<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table_schema,SUM((AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH))\/1024\nFROM information_schema.TABLES \nWHERE table_schema='ocp';\n<\/code><\/pre>\n<p>6.\u7edf\u8ba1\u6bcf\u4e2a\u5e93\u7684\u6570\u636e\u91cf\u5927\u5c0f\uff0c\u5e76\u6309\u6570\u636e\u91cf\u4ece\u5927\u5230\u5c0f\u6392\u5e8f<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT table_schema,SUM((AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH))\/1024\nFROM information_schema.TABLES \nGROUP BY TABLE_SCHEMA;\nORDER BY SUM((AVG_ROW_LENGTH*TABLE_ROWS+INDEX_LENGTH))\/1024 DESC;\n<\/code><\/pre>\n<h5>\u914d\u5408concat()\u51fd\u6570\u62fc\u63a5\u8bed\u53e5\u6216\u547d\u4ee4<\/h5>\n<p>\u4f8b\u5b50:<br \/>\n1.\u6a21\u4eff\u4ee5\u4e0b\u8bed\u53e5\uff0c\u8fdb\u884c\u6570\u636e\u5e93\u7684\u5206\u5e93\u5206\u8868\u5907\u4efd\u3002<\/p>\n<p>mysqldump -uroot -p123 world city &gt;\/bak\/world_ city. sql<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT\nCONCAT(\"mysqldump -uroot -p123\",table_schema,\" \",table_name\n,\" &gt;\/bak\/\",table_schema,\" \",table_name,\".sql\")\nFROM information_schema.tables;\n<\/code><\/pre>\n<p>2.\u6a21\u4eff\u4ee5\u4e0b\u8bed\u53e5,\u8fdb\u884c\u6279\u91cf\u751f\u6210\u5bf9world\u5e93\u4e0b\u6240\u6709\u8868\u8fdb\u884c\u64cd\u4f5c<br \/>\nALTER TABLE world.city DISCARD TABLESPACE;<\/p>\n<pre><code class=\"language-mysql\" lang=\"mysql\">SELECT\nCONCAT(\"ALTER TABLE \",table_schema,\".\",table_name,\" DISCARD TABLESPACE;\")\nFROM information_schema.tables\nWHERE table_schema='school';\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n<h4>show\u8bed\u53e5\u4ecb\u7ecd<\/h4>\n<pre><code class=\"language-mysql\" lang=\"mysql\">show databases;                           #\u67e5\u770b\u6240\u6709\u6570\u636e\u5e93\nshow tables;                              #\u67e5\u770b\u5f53\u524d\u5e93\u7684\u6240\u6709\u8868\nSHOW TABLES FROM                          #\u67e5\u770b\u67d0\u4e2a\u6307\u5b9a\u5e93\u4e0b\u7684\u8868\nshow create database world                #\u67e5\u770b\u5efa\u5e93\u8bed\u53e5\nshow create table world.city              #\u67e5\u770b\u5efa\u8868\u8bed\u53e5\nshow  grants for  root@'localhost'        #\u67e5\u770b\u7528\u6237\u7684\u6743\u9650\u4fe1\u606f\nshow  charset;                            #\u67e5\u770b\u5b57\u7b26\u96c6\nshow collation                            #\u67e5\u770b\u6821\u5bf9\u89c4\u5219\nshow processlist;                         #\u67e5\u770b\u6570\u636e\u5e93\u8fde\u63a5\u60c5\u51b5\nshow index from                           #\u8868\u7684\u7d22\u5f15\u60c5\u51b5\nshow status                               #\u6570\u636e\u5e93\u72b6\u6001\u67e5\u770b\nSHOW STATUS LIKE '%lock%';                #\u6a21\u7cca\u67e5\u8be2\u6570\u636e\u5e93\u67d0\u4e9b\u72b6\u6001\nSHOW VARIABLES                            #\u67e5\u770b\u6240\u6709\u914d\u7f6e\u4fe1\u606f\nSHOW variables LIKE '%lock%';             #\u67e5\u770b\u90e8\u5206\u914d\u7f6e\u4fe1\u606f\nshow engines                              #\u67e5\u770b\u652f\u6301\u7684\u6240\u6709\u7684\u5b58\u50a8\u5f15\u64ce\nshow engine innodb status\\G               #\u67e5\u770bInnoDB\u5f15\u64ce\u76f8\u5173\u7684\u72b6\u6001\u4fe1\u606f\nshow binary logs                          #\u5217\u4e3e\u6240\u6709\u7684\u4e8c\u8fdb\u5236\u65e5\u5fd7\nshow master status                        #\u67e5\u770b\u6570\u636e\u5e93\u7684\u65e5\u5fd7\u4f4d\u7f6e\u4fe1\u606f\nshow binlog evnets in                     #\u67e5\u770b\u4e8c\u8fdb\u5236\u65e5\u5fd7\u4e8b\u4ef6\nshow slave status \\G                      #\u67e5\u770b\u4ece\u5e93\u72b6\u6001\nSHOW RELAYLOG EVENTS in ''                #\u67e5\u770b\u4ece\u5e93relaylog\u4e8b\u4ef6\u4fe1\u606f\ndesc  (show colums from city)             #\u67e5\u770b\u8868\u7684\u5217\u5b9a\u4e49\u4fe1\u606f\n<\/code><\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>mysql\u5185\u7f6e\u7684\u529f\u80fd mysql\u5185\u7f6e\u7684\u529f\u80fd -u \u6307\u5b9a\u7528\u6237\u540d -p \u6307\u5b9a\u5bc6\u7801 -S \u6307\u5b9asock\u6587\u4ef6 -h \u6307 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-53","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/53","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=53"}],"version-history":[{"count":1,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/53\/revisions"}],"predecessor-version":[{"id":54,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=\/wp\/v2\/posts\/53\/revisions\/54"}],"wp:attachment":[{"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=53"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=53"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.daishen.ltd\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=53"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}