{"id":147,"date":"2019-09-05T23:39:04","date_gmt":"2019-09-05T15:39:04","guid":{"rendered":"http:\/\/www.cgh0610.cn\/?p=147"},"modified":"2019-09-05T23:39:04","modified_gmt":"2019-09-05T15:39:04","slug":"mysql%e5%9f%ba%e7%a1%80%e5%9b%9e%e9%a1%be%e4%b9%8b%e8%a1%a8%e5%ae%9a%e4%b9%89","status":"publish","type":"post","link":"https:\/\/www.cgh0610.cn\/?p=147","title":{"rendered":"MySql\u57fa\u7840\u56de\u987e\u4e4b\u8868\u5b9a\u4e49"},"content":{"rendered":"<h2>1.\u521b\u5efa\u8868<\/h2>\n<p>CREATE [TEMPORARY] TABLE tbl_name<br \/>\n(<br \/>\n\u5b57\u6bb5\u540d1 \u6570\u636e\u7c7b\u578b [\u5217\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6] [\u9ed8\u8ba4\u503c],<br \/>\n[\u5b57\u6bb5\u540d2 \u6570\u636e\u7c7b\u578b [\u5217\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f\u6761\u4ef6] [\u9ed8\u8ba4\u503c]]<br \/>\n[,&#8230;]<br \/>\n[\u8868\u7ea7\u5b8c\u6574\u6027\u7ea6\u675f]<br \/>\n)[ENGINE=\u5f15\u64ce\u7c7b\u578b]<\/p>\n<pre><code class=\"language-sql line-numbers\">CREATE TABLE  user\n(\n    `uid` int(10) NOT NULL AUTO_INCREMENT PRIMARY KEY,\n    `name` varchar(10) NOT NULL DEFAULT '' COMMENT '\u59d3\u540d',\n    `age` int(4) NOT NULL DEFAULT 0 COMMENT '\u5e74\u9f84'\n)\n<\/code><\/pre>\n<p>\u6ce8\uff1a\u5176\u4e2d\u201cTEMPORARY\u201d\u4e3a\u4e34\u65f6\u8868\u9009\u9879\uff0c\u4e34\u65f6\u8868\u4e0d\u6c38\u4e45\u4fdd\u7559\uff0c\u65ad\u5f00\u8fde\u63a5\u5373\u81ea\u52a8\u5220\u9664<\/p>\n<h2>2.\u66f4\u65b0\u8868<\/h2>\n<p>\u5728MySQL\u4e2d\uff0c\u901a\u8fc7ALTER TABLE\u8bed\u53e5\u6765\u66f4\u6539\u539f\u6709\u8868\u7ed3\u6784\uff0c\u5e38\u89c1\u64cd\u4f5c\u6709\u589e\u52a0\u6216\u5220\u51cf\u5217\uff0c\u521b\u5efa\u6216\u53d6\u6d88\u7d22\u5f15\uff0c\u66f4\u6539\u539f\u6709\u5217\u7684\u6570\u636e\u7c7b\u578b\u3001\u9ed8\u8ba4\u503c\uff0c\u91cd\u547d\u540d\u8868\u540d\u6216\u5217\u540d\uff0c\u66f4\u6539\u6807\u8bb0\u6ce8\u91ca\u6216\u5f15\u64ce\u7c7b\u578b\uff0c\u66f4\u6539\u7d22\u5f15\u3001\u5916\u952e\u7b49\u7b49<\/p>\n<h3>(1)ADD[COLUMN]\u5b50\u53e5<\/h3>\n<p>\u7528\u4e8e\u5411\u8868\u4e2d\u589e\u52a0\u5217\uff0c\u53ef\u540c\u65f6\u589e\u52a0\u591a\u5217<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE USER\nADD `sex` CHAR(1) DEFAULT 1 COMMENT '1\u4e3a\u7537\uff0c0\u4e3a\u5973' AFTER 'age',\nADD `idcard` VARCHAR(20) COMMENT '\u8eab\u4efd\u8bc1'\n<\/code><\/pre>\n<p>\u6ce8\uff1a\u53ef\u7528\u5173\u952e\u5b57\u201cFIRST\u201d\u5c06\u65b0\u5217\u7f6e\u4e8e\u7b2c\u4e00\u5217\uff0c\u4e5f\u53ef\u7528\u5173\u952e\u5b57\u201cAFTER\u201d \u4f7f\u65b0\u5217\u7f6e\u4e8e\u67d0\u5217\u4e4b\u540e\uff0c\u5982\u201cAFTER \u201d<\/p>\n<h3>(2)CHANGE[COLUMN]\u5b50\u53e5<\/h3>\n<p>\u7528\u4e8e\u4fee\u6539\u5217\u7684\u540d\u79f0\u6216\u6570\u636e\u7c7b\u578b<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE user\nCHANGE age ages int(4)\n<\/code><\/pre>\n<p>\u6ce8\uff1a\u4f7f\u7528change\u5b50\u53e5\u5fc5\u987b\u5199\u4e0a\u4fee\u6539\u540e\u7684\u6570\u636e\u7c7b\u578b\u548c\u6570\u636e\u957f\u5ea6\uff0c\u4fee\u6539\u5217\u7684\u6570\u636e\u7c7b\u578b\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u6216\u5b57\u7b26\u4e32\u957f\u5ea6\u4e0d\u8db3\u88ab\u622a\u65ad<\/p>\n<h3>(3)ALTER[COLUMN]\u5b50\u53e5<\/h3>\n<p>\u7528\u4e8e\u4fee\u6539\u6216\u5220\u9664\u5217\u7684\u9ed8\u8ba4\u503c<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE user\nALTER age SET DEFAULT '1'\n<\/code><\/pre>\n<h3>(4)MODIFY[COLUMN]\u5b50\u53e5<\/h3>\n<p>\u4e0eCHANGE\u5b50\u53e5\u7c7b\u578b\uff0c\u4f46MODIFY\u53ea\u4fee\u6539\u5217\u6570\u636e\u7c7b\u578b\uff0c\u4e0d\u4fee\u6539\u5217\u540d\uff1b\u4e14\u53ef\u901a\u8fc7\u5173\u952e\u5b57\u201cFIRST\u201d,&#8221;AFTER&#8221;\u4fee\u6539\u5217\u7684\u4f4d\u7f6e<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE user\nMODIFY sex char(2)\n<\/code><\/pre>\n<h3>(5)DROP[COLUMN]\u5b50\u53e5<\/h3>\n<p>\u7528\u4e8e\u5220\u9664\u5217<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE user\nDROP sex\n<\/code><\/pre>\n<h3>(6)RENAME[TO]\u5b50\u53e5<\/h3>\n<p>\u7528\u4e8e\u4e3a\u8868\u91cd\u65b0\u547d\u540d<\/p>\n<pre><code class=\"language-sql line-numbers\">ALTER TABLE user\nRENAME TO userinfo\n<\/code><\/pre>\n<h2>3\u91cd\u547d\u540d\u8868<\/h2>\n<h3>(1)RENAME TABLE<\/h3>\n<p>\u9664\u4e86\u4f7f\u7528\u4e0a\u9762ALTER TABLE\u8bed\u53e5\uff0c\u8fd8\u53ef\u76f4\u63a5\u4f7f\u7528RENAME TABLE\u8bed\u53e5\u91cd\u547d\u540d\u8868<\/p>\n<pre><code class=\"language-sql line-numbers\">RENAME TABLE tbl_name TO new_tbl_name\n[,tbl_name2 TO new_tbl_name2]\n<\/code><\/pre>\n<h2>4\u5220\u9664\u8868<\/h2>\n<pre><code class=\"language-sql line-numbers\">DROP[TEMPOPARY] TABLE[IF EXISTS]\ntbl_name[,tal_name2][,...]\n<\/code><\/pre>\n<h2>5\u67e5\u770b\u8868<\/h2>\n<h3>(1)\u663e\u793a\u8868\u540d<\/h3>\n<pre><code class=\"language-sql line-numbers\">SHOW[FULL] TABLES [{FROM|IN} db_name]\n[LIKE 'pattern'|WHERE expr]\n<\/code><\/pre>\n<h3>(2)\u663e\u793a\u8868\u7ed3\u6784<\/h3>\n<pre><code class=\"language-sql line-numbers\">SHOW [FULL] COLUMN {FROM|IN} tbl_name [{FROM|IN} db_name]\n[LIKE 'pattern'|WHERE expr]\n#\u6216\u8005\n{DESCRIBE|DESC} tbl_name [col_name|wild]\n#\u4f8b\u5982\nDESC user;\nDESC user name\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>1.\u521b\u5efa\u8868 CREATE [TEMPORARY] TABLE tbl_name ( \u5b57\u6bb5\u540d1 \u6570\u636e\u7c7b\u578b [\u5217\u7ea7 &hellip; <a href=\"https:\/\/www.cgh0610.cn\/?p=147\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">MySql\u57fa\u7840\u56de\u987e\u4e4b\u8868\u5b9a\u4e49<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":[],"categories":[39,12],"tags":[28],"_links":{"self":[{"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/posts\/147"}],"collection":[{"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=147"}],"version-history":[{"count":2,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/posts\/147\/revisions"}],"predecessor-version":[{"id":149,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=\/wp\/v2\/posts\/147\/revisions\/149"}],"wp:attachment":[{"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=147"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=147"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cgh0610.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=147"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}