{"id":1323,"date":"2024-07-09T14:44:35","date_gmt":"2024-07-09T06:44:35","guid":{"rendered":"https:\/\/blog.nonot.cn\/?p=1323"},"modified":"2024-07-09T14:44:57","modified_gmt":"2024-07-09T06:44:57","slug":"sql%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"https:\/\/blog.nonot.cn\/index.php\/2024\/07\/09\/sql%e4%bc%98%e5%8c%96\/","title":{"rendered":"SQL\u4f18\u5316"},"content":{"rendered":"<pre class=\"best-text mb-10\">1\u3001\u5efa\u7acb\u9002\u5f53\u7684\u7d22\u5f15\u3002sql\u5728\u7d22\u5f15\u5b57\u6bb5\u4e0d\u8981\u52a0\u51fd\u6570\uff0c\u4fdd\u8bc1\u7d22\u5f15\u8d77\u6548\u3002\u5982\u679c\u662f\u590d\u5408\u7d22\u5f15\u6ce8\u610f\u5728sql\u7684\u987a\u5e8f\u3002\u5982\u679c\u5df2\u7ecf\u5b58\u5728\u7d22\u5f15\uff0c\u5efa\u8bae\u4f60\u5148\u91cd\u5efa\u7d22\u5f15\u5148\uff0c\u56e0\u4e3a\u5927\u6570\u636e\u8868\u7684\u7d22\u5f15\u7ef4\u62a4\u5230\u4e86\u4e00\u4e2a\u9636\u6bb5\u5c31\u662f\u4e71\u7684\uff0c\u4e00\u822c\u5efa\u8bae\u91cd\u5efa\u3002\u5efa\u7acb\u597d\u7684\u4e00\u822c\u53ef\u4ee5\u83b7\u5f97\u51e0\u5341\u500d\u7684\u901f\u5ea6\u63d0\u5347\u3002\r\n2\u3001\u6700\u5927\u6570\u636e\u91cf\u7684\u8868\u653e\u5728\u6700\u524d\uff0c\u6700\u5c0f\u7684\u8868\u653e\u5728\u6700\u540e\u9762\u3002sql\u662f\u4ece\u6700\u540e\u9762\u5f00\u59cb\u53cd\u5411\u89e3\u6790\u7684\u3002\r\n3\u3001\u5176\u6b21\u662f\u8981\u628a\u6700\u6709\u6548\u7f29\u5c0f\u8303\u56f4\u7684\u6761\u4ef6\u653e\u5230sql\u672b\u5c3e\u53bb\u3002\u5c24\u5176\u662f\u4e3b\u952e\u6216\u8005\u7d22\u5f15\u5b57\u6bb5\u7684\u6761\u4ef6\u3002\r\n4\u3001\u4fdd\u8bc1\u4f60sql\u7684\u7b97\u6cd5\u5408\u7406\u6027\u3002\u4fdd\u8bc1\u590d\u6742\u5ea6\u548c\u7a7a\u95f4\u5ea6\u7684\u5408\u7406\u6027\u3002\r\n5\u3001\u5fc5\u8981\u65f6\u5019\u4f7f\u7528\u5b58\u50a8\u8fc7\u7a0b\u3002\u63d0\u534730%-40%\u7684\u901f\u5ea6\r\n6\u3001\u5efa\u8bae\u4f60\u5206\u9875\u8bfb\u53d6\u4e0d\u8981\u4e00\u4e0b\u8bfb\u5b8c\u6240\u6709\u7684\u6570\u636e\u3002\uff08\u4f7f\u7528rownum\uff09\uff0c\u4e00\u4e0b\u5b50\u6570\u636e\u592a\u591a\u4f1a\u4f7f\u5f97\u5185\u5b58\u4e0d\u591f\u7528\u7684\u3002\r\n\r\n_____________________________________________________________\r\n1,SELECT\u5b50\u53e5\u4e2d\u907f\u514d\u4f7f\u7528 \u2018 * \u2018\r\n2,\u4e3a\u641c\u7d22\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\r\n3,\u6c38\u8fdc\u4e3a\u6bcf\u5f20\u8868\u8bbe\u7f6e\u4e00\u4e2aID\r\n4,\u5c3d\u53ef\u80fd\u7684\u4f7f\u7528NOT NULL\r\n5,\u5f53\u53ea\u8981\u4e00\u884c\u6570\u636e\u65f6\u4f7f\u7528LIMIT 1\r\n6,\u7528TRUNCATE\u66ff\u4ee3DELETE\uff1a\r\n7,\u7528Where\u5b50\u53e5\u66ff\u6362HAVING\u5b50\u53e5,\u907f\u514d\u4f7f\u7528HAVING\u5b50\u53e5<\/pre>\n<pre class=\"best-text mb-10\">\r\n\r\n\u7d22\u5f15\uff1a\r\n<strong>\u589e\u52a0\u7d22\u5f15\uff1a<\/strong><\/pre>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CREATE INDEX\u53ef\u5bf9\u8868\u589e\u52a0\u666e\u901a\u7d22\u5f15\u6216UNIQUE\u7d22\u5f15\u4ee5\u53ca\u5168\u6587\u7d22\u5f15\uff0c\u4f46\u662f\u4e0d\u53ef\u4ee5\u5bf9\u8868\u589e\u52a0\u4e3b\u952e\u7d22\u5f15<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CREATE\u00a0INDEX\u00a0index_name ON table_name (column_list);<\/div>\n<div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CREATE\u00a0UNIQUE\u00a0index_name ON table_name (column_list);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 CREATE\u00a0FULLTEXT\u00a0index_name ON table_name (column_list);<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0table_name\u3001index_name\u548ccolumn_list\u5177\u6709\u4e0eALTER TABLE\u8bed\u53e5\u4e2d\u76f8\u540c\u7684\u542b\u4e49\uff0c\u7d22\u5f15\u540d\u5fc5\u987b\u6307\u5b9a\u3002<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u53e6\u5916\uff0c\u4e0d\u80fd\u7528CREATE INDEX\u8bed\u53e5\u521b\u5efaPRIMARY KEY\u7d22\u5f15\u3002<\/div>\n<div><\/div>\n<div><\/div>\n<div><strong>\u00a0 \u00a0\u7d22\u5f15\u7c7b\u578b\uff1a<\/strong><\/div>\n<div><\/div>\n<\/div>\n<div>\u00a0 \u00a0\u666e\u901a\u7d22\u5f15INDEX\uff1a\u00a0 \u00a0 \u9002\u7528\u4e8ename\u3001email\u7b49\u4e00\u822c\u5c5e\u6027<\/div>\n<div>\u552f\u4e00\u7d22\u5f15UNIQUE\uff1a\u00a0 \u00a0\u4e0e\u666e\u901a\u7d22\u5f15\u7c7b\u4f3c\uff0c\u4e0d\u540c\u7684\u662f\u552f\u4e00\u7d22\u5f15\u8981\u6c42\u7d22\u5f15\u5b57\u6bb5\u503c\u5728\u8868\u4e2d\u662f\u552f\u4e00\u7684\uff0c\u8fd9\u4e00\u70b9\u548c\u4e3b\u952e\u7d22\u5f15\u7c7b\u4f3c\uff0c\u4f46\u662f\u4e0d\u540c\u7684\u662f\uff0c\u552f\u4e00\u7d22\u5f15\u5141\u8bb8\u6709\u7a7a\u503c\u3002\u552f\u4e00\u7d22\u5f15\u4e00\u822c\u9002\u7528\u4e8e\u8eab\u4efd\u8bc1\u53f7\u7801\u3001\u7528\u6237\u8d26\u53f7\u7b49\u4e0d\u5141\u8bb8\u6709\u91cd\u590d\u7684\u5c5e\u6027\u5b57\u6bb5\u4e0a\u3002<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u4e3b\u952e\u7d22\u5f15\uff1a\u00a0 \u00a0\u5176\u5b9e\u5c31\u662f\u4e3b\u952e\uff0c\u4e00\u822c\u5728\u5efa\u8868\u65f6\u5c31\u6307\u5b9a\u4e86\uff0c\u4e0d\u9700\u8981\u989d\u5916\u6dfb\u52a0\u3002<\/div>\n<div>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u5168\u6587\u68c0\u7d22\uff1a\u00a0 \u00a0\u53ea\u9002\u7528\u4e8eVARCHAR\u548cText\u7c7b\u578b\u7684\u5b57\u6bb5\u3002<\/div>\n<div>\u00a0 \u00a0\u6ce8\u610f\uff1a\u5168\u6587\u7d22\u5f15\u548c\u666e\u901a\u7d22\u5f15\u662f\u6709\u5f88\u5927\u533a\u522b\u7684\uff0c\u5982\u679c\u5efa\u7acb\u7684\u662f\u666e\u901a\u7d22\u5f15\uff0c\u4e00\u822c\u4f1a\u4f7f\u7528like\u8fdb\u884c\u6a21\u7cca\u67e5\u8be2\uff0c\u53ea\u4f1a\u5bf9\u67e5\u8be2\u5185\u5bb9\u524d\u4e00\u90e8\u5206\u6709\u6548\uff0c\u5373\u53ea\u5bf9\u524d\u9762\u4e0d\u4f7f\u7528\u901a\u914d\u7b26\u7684\u67e5\u8be2\u6709\u6548\uff0c\u5982\u679c\u524d\u540e\u90fd\u6709\u901a\u914d\u7b26\uff0c\u666e\u901a\u7d22\u5f15\u5c06\u4e0d\u4f1a\u8d77\u4f5c\u7528\u3002<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u5efa\u7acb\u9002\u5f53\u7684\u7d22\u5f15\u3002sql\u5728\u7d22\u5f15\u5b57\u6bb5\u4e0d\u8981\u52a0\u51fd\u6570\uff0c\u4fdd\u8bc1\u7d22\u5f15\u8d77\u6548&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1323","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/1323","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1323"}],"version-history":[{"count":1,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/1323\/revisions"}],"predecessor-version":[{"id":1324,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/posts\/1323\/revisions\/1324"}],"wp:attachment":[{"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1323"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.nonot.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}