{"id":152709,"date":"2024-11-02T01:22:21","date_gmt":"2024-11-01T17:22:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152709\/"},"modified":"2024-11-02T01:22:23","modified_gmt":"2024-11-01T17:22:23","slug":"%e5%b8%b8%e8%a6%8b-sql-%e7%9f%a5%e8%ad%98%e9%bb%9e%e7%b8%bd%e7%b5%90%ef%bc%8c%e5%bb%ba%e8%ad%b0%e6%94%b6%e8%97%8f%ef%bc%81","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152709\/","title":{"rendered":"\u5e38\u898b SQL \u77e5\u8b58\u9ede\u7e3d\u7d50\uff0c\u5efa\u8b70\u6536\u85cf\uff01"},"content":{"rendered":"<h1 id=\"%e5%b8%b8%e8%a6%8b-sql-%e7%9f%a5%e8%ad%98%e9%bb%9e%e7%b8%bd%e7%b5%90%ef%bc%8c%e5%bb%ba%e8%ad%b0%e6%94%b6%e8%97%8f%ef%bc%81-jDFiuMmFoo\">\u5e38\u898b SQL \u77e5\u8b58\u9ede\u7e3d\u7d50\uff0c\u5efa\u8b70\u6536\u85cf\uff01<\/h1>\n<p>SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7121\u8ad6\u662f\u958b\u767c\u8005\u9084\u662f\u6578\u64da\u5206\u6790\u5e2b\uff0c\u638c\u63e1 SQL \u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u7e3d\u7d50\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u77e5\u8b58\u9ede\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u9580\u8a9e\u8a00\u3002<\/p>\n<h2 id=\"1-sql-%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-jDFiuMmFoo\">1. SQL \u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u5305\u62ec\u6578\u64da\u67e5\u8a62\u3001\u6578\u64da\u63d2\u5165\u3001\u6578\u64da\u66f4\u65b0\u548c\u6578\u64da\u522a\u9664\u7b49\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u8a9e\u53e5\uff1a<\/p>\n<h3 id=\"1-1-%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a-jDFiuMmFoo\">1.1 \u67e5\u8a62\u6578\u64da<\/h3>\n<pre><code>SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u7528\u65bc\u5f9e\u6307\u5b9a\u7684\u8868\u4e2d\u9078\u64c7\u7279\u5b9a\u7684\u5217\uff0c\u4e26\u6839\u64da\u689d\u4ef6\u904e\u6ffe\u7d50\u679c\u3002<\/p>\n<h3 id=\"1-2-%e6%8f%92%e5%85%a5%e6%95%b8%e6%93%9a-jDFiuMmFoo\">1.2 \u63d2\u5165\u6578\u64da<\/h3>\n<pre><code>INSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u7528\u65bc\u5411\u8868\u4e2d\u63d2\u5165\u65b0\u6578\u64da\u3002<\/p>\n<h3 id=\"1-3-%e6%9b%b4%e6%96%b0%e6%95%b8%e6%93%9a-jDFiuMmFoo\">1.3 \u66f4\u65b0\u6578\u64da<\/h3>\n<pre><code>UPDATE table_name SET column1 = value1 WHERE condition;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u7528\u65bc\u66f4\u65b0\u8868\u4e2d\u5df2\u5b58\u5728\u7684\u6578\u64da\u3002<\/p>\n<h3 id=\"1-4-%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a-jDFiuMmFoo\">1.4 \u522a\u9664\u6578\u64da<\/h3>\n<pre><code>DELETE FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u9019\u689d\u8a9e\u53e5\u7528\u65bc\u522a\u9664\u8868\u4e2d\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"2-%e5%b8%b8%e7%94%a8-sql-%e5%87%bd%e6%95%b8-jDFiuMmFoo\">2. \u5e38\u7528 SQL \u51fd\u6578<\/h2>\n<p>SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u5167\u5efa\u51fd\u6578\uff0c\u5e6b\u52a9\u7528\u6236\u9032\u884c\u6578\u64da\u8655\u7406\u548c\u5206\u6790\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684 SQL \u51fd\u6578\uff1a<\/p>\n<h3 id=\"2-1-%e8%81%9a%e5%90%88%e5%87%bd%e6%95%b8-jDFiuMmFoo\">2.1 \u805a\u5408\u51fd\u6578<\/h3>\n<ul>\n<li><code>COUNT()<\/code>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<li><code>SUM()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u5217\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u5217\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>MAX()<\/code>\uff1a\u7372\u53d6\u6578\u503c\u5217\u7684\u6700\u5927\u503c\u3002<\/li>\n<li><code>MIN()<\/code>\uff1a\u7372\u53d6\u6578\u503c\u5217\u7684\u6700\u5c0f\u503c\u3002<\/li>\n<\/ul>\n<h3 id=\"2-2-%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%87%bd%e6%95%b8-jDFiuMmFoo\">2.2 \u5b57\u7b26\u4e32\u51fd\u6578<\/h3>\n<ul>\n<li><code>CONCAT()<\/code>\uff1a\u9023\u63a5\u5169\u500b\u6216\u591a\u500b\u5b57\u7b26\u4e32\u3002<\/li>\n<li><code>LENGTH()<\/code>\uff1a\u8fd4\u56de\u5b57\u7b26\u4e32\u7684\u9577\u5ea6\u3002<\/li>\n<li><code>UPPER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5927\u5beb\u3002<\/li>\n<li><code>LOWER()<\/code>\uff1a\u5c07\u5b57\u7b26\u4e32\u8f49\u63db\u70ba\u5c0f\u5beb\u3002<\/li>\n<\/ul>\n<h2 id=\"3-sql-%e7%9a%84-join-%e6%93%8d%e4%bd%9c-jDFiuMmFoo\">3. SQL \u7684 JOIN \u64cd\u4f5c<\/h2>\n<p>JOIN \u64cd\u4f5c\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\u3002\u5e38\u898b\u7684 JOIN \u985e\u578b\u5305\u62ec\uff1a<\/p>\n<h3 id=\"3-1-inner-join-jDFiuMmFoo\">3.1 INNER JOIN<\/h3>\n<p>\u8fd4\u56de\u5169\u500b\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/p>\n<pre><code>SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n<h3 id=\"3-2-left-join-jDFiuMmFoo\">3.2 LEFT JOIN<\/h3>\n<p>\u8fd4\u56de\u5de6\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u53f3\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/p>\n<pre><code>SELECT columns FROM table1 LEFT JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n<h3 id=\"3-3-right-join-jDFiuMmFoo\">3.3 RIGHT JOIN<\/h3>\n<p>\u8fd4\u56de\u53f3\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5373\u4f7f\u5de6\u8868\u4e2d\u6c92\u6709\u5339\u914d\u7684\u884c\u3002<\/p>\n<pre><code>SELECT columns FROM table1 RIGHT JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n<h2 id=\"4-sql-%e7%9a%84%e7%b4%a2%e5%bc%95-jDFiuMmFoo\">4. SQL \u7684\u7d22\u5f15<\/h2>\n<p>\u7d22\u5f15\u662f\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u7684\u6578\u64da\u7d50\u69cb\u3002\u901a\u904e\u5728\u8868\u7684\u67d0\u4e9b\u5217\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u5275\u5efa\u7d22\u5f15\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>CREATE INDEX index_name ON table_name (column1, column2);<\/code><\/pre>\n<h2 id=\"5-sql-%e7%9a%84%e4%ba%8b%e5%8b%99%e7%ae%a1%e7%90%86-jDFiuMmFoo\">5. SQL \u7684\u4e8b\u52d9\u7ba1\u7406<\/h2>\n<p>\u4e8b\u52d9\u662f\u4e00\u7d44\u64cd\u4f5c\u7684\u96c6\u5408\uff0c\u9019\u4e9b\u64cd\u4f5c\u8981\u9ebc\u5168\u90e8\u6210\u529f\uff0c\u8981\u9ebc\u5168\u90e8\u5931\u6557\u3002\u4f7f\u7528\u4e8b\u52d9\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u57fa\u672c\u7684\u4e8b\u52d9\u64cd\u4f5c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>BEGIN TRANSACTION<\/code>\uff1a\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\u3002<\/li>\n<li><code>COMMIT<\/code>\uff1a\u63d0\u4ea4\u4e8b\u52d9\u3002<\/li>\n<li><code>ROLLBACK<\/code>\uff1a\u56de\u6efe\u4e8b\u52d9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-jDFiuMmFoo\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 SQL \u7684\u57fa\u672c\u77e5\u8b58\u548c\u64cd\u4f5c\u5c0d\u65bc\u6578\u64da\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u67e5\u8a62\u3001\u6578\u64da\u5206\u6790\u9084\u662f\u6578\u64da\u5eab\u8a2d\u8a08\uff0cSQL \u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u5e0c\u671b\u672c\u6587\u7684\u7e3d\u7d50\u80fd\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3 SQL \u7684\u57fa\u672c\u6982\u5ff5\u548c\u64cd\u4f5c\u6280\u5de7\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u9084\u662f <a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5e38\u898b SQL \u77e5\u8b58\u9ede\u7e3d\u7d50\uff0c\u6db5\u84cb\u57fa\u672c\u8a9e\u6cd5\u3001\u67e5\u8a62\u6280\u5de7\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u9069\u5408\u521d\u5b78\u8005\u8207\u9032\u968e\u8005\uff0c\u5efa\u8b70\u6536\u85cf\uff01<\/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-152709","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152709","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=152709"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152709\/revisions"}],"predecessor-version":[{"id":152710,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152709\/revisions\/152710"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152709"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152709"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}