{"id":143861,"date":"2024-11-01T01:52:21","date_gmt":"2024-10-31T17:52:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143861\/"},"modified":"2024-11-01T01:52:22","modified_gmt":"2024-10-31T17:52:22","slug":"sql-%e9%9d%a2%e8%a9%a6%e9%a1%8c%e5%8f%8a%e7%ad%94%e6%a1%88%e5%a4%a7%e5%85%a8%ef%bc%8c%e8%ae%93%e4%bd%a0%e8%bc%95%e9%ac%86%e6%87%89%e5%b0%8d%e9%9d%a2%e8%a9%a6%e6%8c%91%e6%88%b0-%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143861\/","title":{"rendered":"SQL \u9762\u8a66\u984c\u53ca\u7b54\u6848\u5927\u5168\uff0c\u8b93\u4f60\u8f15\u9b06\u61c9\u5c0d\u9762\u8a66\u6311\u6230 (\u6578\u64da\u5eab sql \u9762\u8a66\u984c\u53ca\u7b54\u6848)"},"content":{"rendered":"<h1 id=\"sql-%e9%9d%a2%e8%a9%a6%e9%a1%8c%e5%8f%8a%e7%ad%94%e6%a1%88%e5%a4%a7%e5%85%a8%ef%bc%8c%e8%ae%93%e4%bd%a0%e8%bc%95%e9%ac%86%e6%87%89%e5%b0%8d%e9%9d%a2%e8%a9%a6%e6%8c%91%e6%88%b0-%e6%95%b8%e6%93%9a-yHsHrGwUcM\">SQL \u9762\u8a66\u984c\u53ca\u7b54\u6848\u5927\u5168\uff0c\u8b93\u4f60\u8f15\u9b06\u61c9\u5c0d\u9762\u8a66\u6311\u6230 (\u6578\u64da\u5eab SQL \u9762\u8a66\u984c\u53ca\u7b54\u6848)<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u5df2\u6210\u70ba\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u6578\u64da\u5206\u6790\u5e2b\u3001\u6578\u64da\u79d1\u5b78\u5bb6\u9084\u662f\u5f8c\u7aef\u958b\u767c\u4eba\u54e1\uff0c\u638c\u63e1 SQL \u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002\u5728\u9762\u8a66\u4e2d\uff0cSQL \u7684\u554f\u984c\u7d93\u5e38\u51fa\u73fe\uff0c\u56e0\u6b64\u6e96\u5099\u597d\u76f8\u95dc\u7684\u9762\u8a66\u984c\u53ca\u7b54\u6848\u5c07\u6709\u52a9\u65bc\u4f60\u5728\u9762\u8a66\u4e2d\u812b\u7a4e\u800c\u51fa\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b-sql-%e9%9d%a2%e8%a9%a6%e9%a1%8c-yHsHrGwUcM\">\u5e38\u898b SQL \u9762\u8a66\u984c<\/h2>\n<h3 id=\"1-sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-yHsHrGwUcM\">1. SQL \u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<ul>\n<li><strong>\u4ec0\u9ebc\u662f SQL\uff1f<\/strong> SQL \u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002<\/li>\n<li><strong>\u4ec0\u9ebc\u662f\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff1f<\/strong> \u95dc\u4fc2\u578b\u6578\u64da\u5eab\u662f\u4ee5\u8868\u683c\u5f62\u5f0f\u5b58\u5132\u6578\u64da\u7684\u6578\u64da\u5eab\uff0c\u8868\u683c\u4e4b\u9593\u53ef\u4ee5\u901a\u904e\u95dc\u806f\u9032\u884c\u9023\u63a5\u3002<\/li>\n<\/ul>\n<h3 id=\"2-%e5%9f%ba%e6%9c%ac%e6%9f%a5%e8%a9%a2-yHsHrGwUcM\">2. \u57fa\u672c\u67e5\u8a62<\/h3>\n<ul>\n<li><strong>\u5982\u4f55\u5f9e\u4e00\u500b\u8868\u4e2d\u9078\u64c7\u6240\u6709\u5217\u7684\u6578\u64da\uff1f<\/strong>\n<pre><code>SELECT * FROM \u8868\u540d;<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u9078\u64c7\u7279\u5b9a\u5217\u7684\u6578\u64da\uff1f<\/strong>\n<pre><code>SELECT \u5217\u540d1, \u5217\u540d2 FROM \u8868\u540d;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3 id=\"3-%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2-yHsHrGwUcM\">3. \u689d\u4ef6\u67e5\u8a62<\/h3>\n<ul>\n<li><strong>\u5982\u4f55\u4f7f\u7528 WHERE \u5b50\u53e5\u9032\u884c\u689d\u4ef6\u67e5\u8a62\uff1f<\/strong>\n<pre><code>SELECT * FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u4f7f\u7528 AND \u548c OR \u9032\u884c\u8907\u96dc\u67e5\u8a62\uff1f<\/strong>\n<pre><code>SELECT * FROM \u8868\u540d WHERE \u689d\u4ef61 AND \u689d\u4ef62;<\/code><\/pre>\n<pre><code>SELECT * FROM \u8868\u540d WHERE \u689d\u4ef61 OR \u689d\u4ef62;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3 id=\"4-%e6%95%b8%e6%93%9a%e6%8e%92%e5%ba%8f%e5%92%8c%e5%88%86%e7%b5%84-yHsHrGwUcM\">4. \u6578\u64da\u6392\u5e8f\u548c\u5206\u7d44<\/h3>\n<ul>\n<li><strong>\u5982\u4f55\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff1f<\/strong>\n<pre><code>SELECT * FROM \u8868\u540d ORDER BY \u5217\u540d ASC|DESC;<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u4f7f\u7528 GROUP BY \u9032\u884c\u5206\u7d44\uff1f<\/strong>\n<pre><code>SELECT \u5217\u540d, COUNT(*) FROM \u8868\u540d GROUP BY \u5217\u540d;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3 id=\"5-%e6%95%b8%e6%93%9a%e6%93%8d%e4%bd%9c-yHsHrGwUcM\">5. \u6578\u64da\u64cd\u4f5c<\/h3>\n<ul>\n<li><strong>\u5982\u4f55\u63d2\u5165\u65b0\u6578\u64da\uff1f<\/strong>\n<pre><code>INSERT INTO \u8868\u540d (\u5217\u540d1, \u5217\u540d2) VALUES (\u503c1, \u503c2);<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u66f4\u65b0\u73fe\u6709\u6578\u64da\uff1f<\/strong>\n<pre><code>UPDATE \u8868\u540d SET \u5217\u540d = \u65b0\u503c WHERE \u689d\u4ef6;<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u522a\u9664\u6578\u64da\uff1f<\/strong>\n<pre><code>DELETE FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h3 id=\"6-%e9%80%b2%e9%9a%8e%e6%9f%a5%e8%a9%a2-yHsHrGwUcM\">6. \u9032\u968e\u67e5\u8a62<\/h3>\n<ul>\n<li><strong>\u4ec0\u9ebc\u662f JOIN\uff1f<\/strong> JOIN \u7528\u65bc\u5c07\u5169\u500b\u6216\u591a\u500b\u8868\u7684\u6578\u64da\u6839\u64da\u76f8\u95dc\u5217\u9032\u884c\u9023\u63a5\u3002<\/li>\n<li><strong>\u5982\u4f55\u4f7f\u7528 INNER JOIN\uff1f<\/strong>\n<pre><code>SELECT \u5217\u540d FROM \u88681 INNER JOIN \u88682 ON \u88681.\u5217\u540d = \u88682.\u5217\u540d;<\/code><\/pre>\n<\/li>\n<li><strong>\u5982\u4f55\u4f7f\u7528 LEFT JOIN\uff1f<\/strong>\n<pre><code>SELECT \u5217\u540d FROM \u88681 LEFT JOIN \u88682 ON \u88681.\u5217\u540d = \u88682.\u5217\u540d;<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2 id=\"%e9%9d%a2%e8%a9%a6%e6%ba%96%e5%82%99%e5%b0%8f%e8%b2%bc%e5%a3%ab-yHsHrGwUcM\">\u9762\u8a66\u6e96\u5099\u5c0f\u8cbc\u58eb<\/h2>\n<p>\u5728\u6e96\u5099 SQL \u9762\u8a66\u6642\uff0c\u9664\u4e86\u719f\u6089\u5e38\u898b\u7684\u554f\u984c\u548c\u7b54\u6848\u5916\uff0c\u9084\u61c9\u8a72\u591a\u505a\u5be6\u8e10\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u65b9\u5f0f\u63d0\u5347\u81ea\u5df1\u7684 SQL \u6280\u80fd\uff1a<\/p>\n<ul>\n<li>\u53c3\u52a0\u7dda\u4e0a SQL \u8ab2\u7a0b\u6216\u5de5\u4f5c\u574a\u3002<\/li>\n<li>\u4f7f\u7528 SQL \u7df4\u7fd2\u5e73\u53f0\u9032\u884c\u5be6\u969b\u64cd\u4f5c\u3002<\/li>\n<li>\u95b1\u8b80\u76f8\u95dc\u66f8\u7c4d\u548c\u8cc7\u6599\uff0c\u6df1\u5165\u7406\u89e3 SQL \u7684\u539f\u7406\u548c\u6700\u4f73\u5be6\u8e10\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-yHsHrGwUcM\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 SQL \u662f\u9032\u5165\u6578\u64da\u9818\u57df\u7684\u95dc\u9375\u4e00\u6b65\u3002\u901a\u904e\u719f\u6089\u5e38\u898b\u7684 SQL \u9762\u8a66\u984c\u53ca\u5176\u7b54\u6848\uff0c\u4f60\u5c07\u80fd\u5920\u5728\u9762\u8a66\u4e2d\u81ea\u4fe1\u5730\u5c55\u793a\u81ea\u5df1\u7684\u6280\u80fd\u3002\u7121\u8ad6\u4f60\u662f\u5c0b\u627e <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u9084\u662f\u5176\u4ed6\u6578\u64da\u5eab\u7ba1\u7406\u9700\u6c42\uff0c\u6301\u7e8c\u5b78\u7fd2\u548c\u5be6\u8e10\u90fd\u662f\u6210\u529f\u7684\u95dc\u9375\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5168\u9762\u7684 SQL \u9762\u8a66\u984c\u53ca\u7b54\u6848\u5927\u5168\uff0c\u5e6b\u52a9\u4f60\u8f15\u9b06\u6e96\u5099\u6578\u64da\u5eab\u9762\u8a66\uff0c\u63d0\u5347\u61c9\u5c0d\u6311\u6230\u7684\u4fe1\u5fc3\u8207\u80fd\u529b\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-143861","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143861","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=143861"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143861\/revisions"}],"predecessor-version":[{"id":143862,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143861\/revisions\/143862"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143861"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143861"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143861"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}