{"id":76,"date":"2018-04-16T01:31:45","date_gmt":"2018-04-15T17:31:45","guid":{"rendered":"http:\/\/yanzhenhua.top\/?p=76"},"modified":"2018-04-16T01:31:45","modified_gmt":"2018-04-15T17:31:45","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%b8%ad%e7%b4%a2%e5%bc%95%e7%9a%84%e7%b1%bb%e5%9e%8b%e5%92%8c%e8%af%ad%e6%b3%95","status":"publish","type":"post","link":"http:\/\/yanzhenhua.top\/?p=76","title":{"rendered":"mysql\u6570\u636e\u5e93\u4e2d\u7d22\u5f15\u7684\u7c7b\u578b\u548c\u8bed\u6cd5"},"content":{"rendered":"<p>1\u3001\u4ec0\u4e48\u662f\u7d22\u5f15<br \/>\n\u5b58\u50a8\u5f15\u64ce\u4ee5\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u5b58\u50a8\u7684\u6570\u636e\u3002<br \/>\n\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u7684\u6570\u636e\u8ba9\u6211\u4eec\u67e5\u8be2\u6570\u636e\u65f6\u975e\u5e38\u7684\u9ad8\u6548<\/p>\n<p>2\u3001\u975e\u5e38\u91cd\u8981\u7684\u7d22\u5f15\u7c7b\u578b<br \/>\n1\uff09\u4e3b\u952e\u7d22\u5f15\uff08primary key\uff09<br \/>\n\u6dfb\u52a0\u6211\u4eec\u7684\u4e3b\u952e\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name add primary key (id)\n<\/code><\/pre>\n<p>\u5220\u9664\u4e3b\u952e\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name drop primary key;\n<\/code><\/pre>\n<p>\u5220\u9664\u7684\u65f6\u5019\uff0c\u6709\u81ea\u52a8\u589e\u957f\u7684\u503c\uff0c\u662f\u4e0d\u80fd\u8fdb\u884c\u5220\u9664\u7684\uff0c\u5148\u5220\u9664\u81ea\u52a8\u589e\u957f\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table innodb modify `id` int(11) unsigned NOT NULL;\n<\/code><\/pre>\n<p>2\uff09\u552f\u4e00\u7d22\u5f15\uff08unique key\uff09<br \/>\n\u6dfb\u52a0\u552f\u4e00\u7d22\u5f15\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name add unique key \u53d6\u4e2a\u7d22\u5f15\u540d(\u5b57\u6bb5\u503c)\n<\/code><\/pre>\n<p>\u5220\u9664\u552f\u4e00\u7d22\u5f15\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name drop key \u7d22\u5f15\u540d\u79f0\n<\/code><\/pre>\n<p>\u91cd\u70b9\u4ecb\u7ecd\uff1a<br \/>\n\u552f\u4e00\u7d22\u5f15\u53ef\u4ee5\u5728\u4e00\u5f20\u8868\u91cc\u9762\u6709\u591a\u4e2a\uff1b\u503c\u662f\u4e0d\u80fd\u91cd\u590d\u7684\u3002<br \/>\n\u4e3b\u952e\u7d22\u5f15\u5728\u5de5\u4f5c\u4e2d\u5fc5\u9700\u4f7f\u7528\u7684\uff1b\u4e3b\u952e\u7d22\u5f15\u5728\u4e00\u5f20\u8868\u91cc\u9762\u53ea\u6709\u4e00\u4e2a\uff1b\u503c\u662f\u4e0d\u80fd\u91cd\u590d\u7684\u3002<\/p>\n<p>3\uff09\u666e\u901a\u7d22\u5f15\uff08key\uff09<br \/>\n\u6dfb\u52a0\u666e\u901a\u7d22\u5f15\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name add key \u53d6\u4e2a\u7d22\u5f15\u540d(\u5b57\u6bb5)\n<\/code><\/pre>\n<p>\u5220\u9664\u666e\u901a\u7d22\u5f15\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name drop key  \u53d6\u7684\u7d22\u5f15\u540d\n<\/code><\/pre>\n<p>\u7279\u6027\uff1a\u592a\u666e\u901a\u4e86\uff0c\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u53ef\u4ee5\u91cd\u590d\u503c\uff01<\/p>\n<p>4\uff09\u590d\u5408\u7d22\u5f15<br \/>\n\u6dfb\u52a0\u590d\u5408\u7d22\u5f15\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name add key \u53d6\u4e2a\u7d22\u5f15\u540d(\u5b57\u6bb5,\u5b57\u6bb5)\n<\/code><\/pre>\n<p>\u5220\u9664\u5b83\uff1a<\/p>\n<pre class=\"line-numbers prism-highlight\" data-start=\"1\"><code class=\"language-sql\">alter table table_name drop key \u7d22\u5f15\u540d\n<\/code><\/pre>\n<p>\u590d\u5408\u7d22\u5f15\uff1a\u5c31\u662f\u4e0a\u9762\u7684\u4e09\u4e2a\u7d22\u5f15\u5728\u8bbe\u5b9a\u5b57\u6bb5\u503c\u7684\u65f6\u5019\uff0c\u8bbe\u5b9a\u591a\u4e2a\uff01<br \/>\n\u590d\u5408\u7d22\u5f15\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u591a\u662f\u4f7f\u7528\u5728\u666e\u901a\u7d22\u5f15\u4e0a\u9762\u7684\u3002<\/p>\n<p><strong>\u603b\u7ed3<\/strong><br \/>\n\u6dfb\u52a0\u7d22\u5f15\u7684\u65f6\u5019\uff1a<br \/>\n\u4e3b\u952e\u7d22\u5f15\uff1a\u8868\u91cc\u9762\u552f\u4e00\u7684\uff0c\u503c\u4e0d\u80fd\u91cd\u590d<br \/>\n    alter table table_name add primary key (id)<br \/>\n\u552f\u4e00\u7d22\u5f15\uff1a\u8868\u91cc\u9762\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u503c\u4e0d\u80fd\u91cd\u590d<br \/>\n    alter table table_name add unique key \u7d22\u5f15\u540d(\u5b57\u6bb5)<br \/>\n\u666e\u901a\u7d22\u5f15\uff1a\u8868\u91cc\u9762\u53ef\u4ee5\u6709\u591a\u4e2a\uff0c\u503c\u53ef\u4ee5\u91cd\u590d<br \/>\n    alter table table_name add key \u7d22\u5f15\u540d(\u5b57\u6bb5)<br \/>\n\u666e\u901a\u590d\u5408\u7d22\u5f15\uff1a<br \/>\n    alter table table_name add key \u7d22\u5f15\u540d(\u5b57\u6bb5,\u5b57\u6bb5,\u2026\u2026)<\/p>\n<p>\u5220\u9664\u7d22\u5f15\u7684\u65f6\u5019\uff1a<br \/>\n\u4e3b\u952e\u7d22\u5f15\uff1a<br \/>\n    alter table table_name drop primary key<br \/>\n\u552f\u4e00\u7d22\u5f15|\u666e\u901a\u7d22\u5f15|\u666e\u901a\u590d\u5408\u7d22\u5f15<br \/>\n    alter table table_name drop key \u7d22\u5f15\u540d<\/p>\n<p>\u590d\u5408\u7d22\u5f15 === \u8054\u5408\u7d22\u5f15 \u8fd9\u4e8c\u4e2a\u540d\u79f0\u662f\u4e00\u4e2a\u610f\u601d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u4ec0\u4e48\u662f\u7d22\u5f15 \u5b58\u50a8\u5f15\u64ce\u4ee5\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u8fdb\u884c\u5b58\u50a8\u7684\u6570\u636e\u3002 \u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u7684\u6570\u636e\u8ba9\u6211\u4eec\u67e5\u8be2\u6570\u636e\u65f6\u975e\u5e38\u7684\u9ad8\u6548&hellip; <a href=\"http:\/\/yanzhenhua.top\/?p=76\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">mysql\u6570\u636e\u5e93\u4e2d\u7d22\u5f15\u7684\u7c7b\u578b\u548c\u8bed\u6cd5<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":{"0":"post-76","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-mysql","7":"h-entry","9":"h-as-article"},"_links":{"self":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts\/76","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=76"}],"version-history":[{"count":0,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=\/wp\/v2\/posts\/76\/revisions"}],"wp:attachment":[{"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=76"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=76"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yanzhenhua.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=76"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}