{"id":1290,"date":"2026-01-10T10:21:26","date_gmt":"2026-01-10T02:21:26","guid":{"rendered":"https:\/\/www.52runoob.com\/?p=1290"},"modified":"2026-01-10T10:21:26","modified_gmt":"2026-01-10T02:21:26","slug":"sql%e8%af%ad%e5%8f%a5%e4%b8%ad%e6%95%b0%e6%8d%ae%e5%ba%93%e5%88%ab%e5%90%8d%e5%91%bd%e5%90%8d%e5%92%8c%e6%9f%a5%e8%af%a2%e9%97%ae%e9%a2%98%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.52runoob.com\/index.php\/2026\/01\/10\/sql%e8%af%ad%e5%8f%a5%e4%b8%ad%e6%95%b0%e6%8d%ae%e5%ba%93%e5%88%ab%e5%90%8d%e5%91%bd%e5%90%8d%e5%92%8c%e6%9f%a5%e8%af%a2%e9%97%ae%e9%a2%98%e8%a7%a3%e6%9e%90\/","title":{"rendered":"sql\u8bed\u53e5\u4e2d\u6570\u636e\u5e93\u522b\u540d\u547d\u540d\u548c\u67e5\u8be2\u95ee\u9898\u89e3\u6790"},"content":{"rendered":"\n<p>\u4e0b\u9762\u6211\u4ece**\u201c\u6570\u636e\u5e93\/\u8868\u522b\u540d\u5982\u4f55\u547d\u540d\u201d<strong>\u4ee5\u53ca<\/strong>\u201c\u5e38\u89c1\u67e5\u8be2\u95ee\u9898\u4e0e\u89e3\u6790\u201d**\u4e24\u4e2a\u7ef4\u5ea6\uff0c\u7cfb\u7edf\u5730\u7ed9\u4f60\u8bb2\u6e05\u695a SQL \u4e2d\u522b\u540d\u7684\u4f7f\u7528\u89c4\u5219\u548c\u5bb9\u6613\u8e29\u5751\u7684\u5730\u65b9\uff0c\u504f\u5b9e\u6218\u5411\uff0c\u9002\u5408\u65e5\u5e38\u5f00\u53d1\u548c\u9762\u8bd5 \ud83d\udc4d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001SQL \u4e2d\u7684\u201c\u522b\u540d\u201d\u5230\u5e95\u6307\u4ec0\u4e48\uff1f<\/h2>\n\n\n\n<p>\u5728 SQL \u91cc\uff0c\u5e38\u89c1\u7684\u522b\u540d\u6709\u4e09\u7c7b\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8868\u522b\u540d\uff08Table Alias\uff09<\/strong> \u2705 \u6700\u5e38\u7528<\/li>\n\n\n\n<li><strong>\u5b57\u6bb5\u522b\u540d\uff08Column Alias\uff09<\/strong><\/li>\n\n\n\n<li><strong>\u5b50\u67e5\u8be2 \/ \u6d3e\u751f\u8868\u522b\u540d<\/strong><\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u26a0\ufe0f \u4e25\u683c\u6765\u8bf4 <strong>\u6570\u636e\u5e93\u672c\u8eab\u4e00\u822c\u4e0d\u53d6\u522b\u540d<\/strong>\uff0c\u4f46\u53ef\u4ee5\u901a\u8fc7 <code>schema.table<\/code> + \u8868\u522b\u540d\u6765\u5b9e\u73b0\u7c7b\u4f3c\u6548\u679c\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u8868\u522b\u540d\u547d\u540d\u89c4\u5219\u4e0e\u89c4\u8303<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 \u57fa\u672c\u8bed\u6cd5<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM user u;\n\n<\/pre><\/div>\n\n\n<p>\u6216\uff08MySQL \/ Oracle \u63a8\u8350\uff09<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM user AS u;\n\n<\/pre><\/div>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><code>AS<\/code> \u53ef\u5199\u53ef\u4e0d\u5199\uff08MySQL \u4e2d\uff09<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\ufe0f\u20e3 \u8868\u522b\u540d\u7684\u4f5c\u7528<\/h3>\n\n\n\n<p>\u2705 <strong>\u7b80\u5316\u4e66\u5199<\/strong><br>\u2705 <strong>\u591a\u8868\u5173\u8054\u65f6\u907f\u514d\u6b67\u4e49<\/strong><br>\u2705 <strong>\u63d0\u9ad8 SQL \u53ef\u8bfb\u6027<\/strong><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6ca1\u6709\u522b\u540d\uff08\u4e0d\u63a8\u8350\uff09<\/h4>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT user.id, user.name, order.id\nFROM user\nJOIN order ON user.id = order.user_id;\n\n<\/pre><\/div>\n\n\n<h4 class=\"wp-block-heading\">\u4f7f\u7528\u522b\u540d\uff08\u63a8\u8350\uff09<\/h4>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT u.id, u.name, o.id\nFROM user u\nJOIN order o ON u.id = o.user_id;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\ufe0f\u20e3 \u8868\u522b\u540d\u547d\u540d\u5efa\u8bae\uff08\u6700\u4f73\u5b9e\u8df5\uff09<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u573a\u666f<\/th><th>\u63a8\u8350\u65b9\u5f0f<\/th><th>\u793a\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>\u5355\u8868<\/td><td>\u8868\u540d\u9996\u5b57\u6bcd<\/td><td><code>user u<\/code><\/td><\/tr><tr><td>\u591a\u8868<\/td><td>\u4e1a\u52a1\u7f29\u5199<\/td><td><code>order o<\/code><\/td><\/tr><tr><td>\u540c\u8868\u591a\u6b21<\/td><td>\u6709\u8bed\u4e49\u7684\u522b\u540d<\/td><td><code>employee e1, employee e2<\/code><\/td><\/tr><tr><td>\u590d\u6742\u67e5\u8be2<\/td><td>\u53ef\u8bfb\u6027\u4f18\u5148<\/td><td><code>student stu<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u274c \u4e0d\u63a8\u8350\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nFROM user a, order b\n\n<\/pre><\/div>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u9762\u8bd5\u5b98\u770b\u5230 <code>a b c d<\/code> \u4e00\u822c\u4f1a\u76b1\u7709 \ud83d\ude05<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u5b57\u6bb5\u522b\u540d\uff08SELECT \u5217\u522b\u540d\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 \u57fa\u672c\u7528\u6cd5<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT name AS username, age AS user_age\nFROM user;\n\n<\/pre><\/div>\n\n\n<p>\u6216\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT name username, age user_age\nFROM user;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\ufe0f\u20e3 \u5b57\u6bb5\u522b\u540d\u5e38\u89c1\u7528\u9014<\/h3>\n\n\n\n<p>\u2714 \u524d\u7aef\u5b57\u6bb5\u6620\u5c04<br>\u2714 \u7edf\u8ba1\u5b57\u6bb5\u547d\u540d<br>\u2714 \u89e3\u51b3\u5b57\u6bb5\u540d\u51b2\u7a81<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT\n    u.name AS user_name,\n    o.create_time AS order_time\nFROM user u\nJOIN orders o ON u.id = o.user_id;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\ufe0f\u20e3 \u4e2d\u6587 \/ \u7279\u6b8a\u5b57\u7b26\u522b\u540d\uff08\u614e\u7528\uff09<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT name AS &#039;\u7528\u6237\u540d&#039;\nFROM user;\n\n<\/pre><\/div>\n\n\n<p>\u6216\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT name AS &quot;user name&quot;\nFROM user;\n\n<\/pre><\/div>\n\n\n<p>\u26a0\ufe0f <strong>\u95ee\u9898\u70b9\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u5229\u4e8e\u7a0b\u5e8f\u6620\u5c04<\/li>\n\n\n\n<li>\u4e0d\u540c\u6570\u636e\u5e93\u517c\u5bb9\u6027\u5dee<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u5b50\u67e5\u8be2 \/ \u6d3e\u751f\u8868\u522b\u540d\uff08\u5fc5\u987b\u6709\uff01\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 \u9519\u8bef\u5199\u6cd5 \u274c<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM (\n    SELECT id, name FROM user\n);\n\n<\/pre><\/div>\n\n\n<p>\ud83d\udca5 <strong>\u76f4\u63a5\u62a5\u9519<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\ufe0f\u20e3 \u6b63\u786e\u5199\u6cd5 \u2705<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM (\n    SELECT id, name FROM user\n) u;\n\n<\/pre><\/div>\n\n\n<p>\ud83d\udccc <strong>\u7ed3\u8bba\uff1a<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>\u5b50\u67e5\u8be2\u4f5c\u4e3a\u8868\u4f7f\u7528\u65f6\uff0c\u5fc5\u987b\u6709\u522b\u540d<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u522b\u540d\u4f5c\u7528\u57df\u95ee\u9898\uff08\u91cd\u70b9 + \u5e38\u89c1\u5751\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 WHERE \u4e2d\u4e0d\u80fd\u7528 SELECT \u522b\u540d\uff08MySQL\uff09<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT price * 0.8 AS final_price\nFROM product\nWHERE final_price &gt; 100;   -- \u274c\n\n<\/pre><\/div>\n\n\n<h3 class=\"wp-block-heading\">\u6b63\u786e\u5199\u6cd5<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT price * 0.8 AS final_price\nFROM product\nWHERE price * 0.8 &gt; 100;\n\n<\/pre><\/div>\n\n\n<p>\u6216\u8005\u4f7f\u7528\u5b50\u67e5\u8be2\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM (\n    SELECT price * 0.8 AS final_price\n    FROM product\n) t\nWHERE final_price &gt; 100;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2\ufe0f\u20e3 ORDER BY \u53ef\u4ee5\u4f7f\u7528\u5b57\u6bb5\u522b\u540d \u2705<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT price * 0.8 AS final_price\nFROM product\nORDER BY final_price DESC;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3\ufe0f\u20e3 GROUP BY \u4e0e\u522b\u540d\uff08\u6570\u636e\u5e93\u5dee\u5f02\uff09<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT dept_id, COUNT(*) AS cnt\nFROM employee\nGROUP BY dept_id;\n\n<\/pre><\/div>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u2757 <strong>GROUP BY \u901a\u5e38\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528 SELECT \u522b\u540d<\/strong>\uff08\u6807\u51c6 SQL\uff09<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u591a\u8868\u67e5\u8be2\u4e2d\u7684\u6b67\u4e49\u95ee\u9898\u89e3\u6790<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1\ufe0f\u20e3 \u5b57\u6bb5\u540d\u91cd\u590d\uff08\u5fc5\u987b\u52a0\u522b\u540d\uff09<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT id\nFROM user u\nJOIN order o ON u.id = o.user_id;\n\n<\/pre><\/div>\n\n\n<p>\u274c \u62a5\u9519\uff1a<code>Column 'id' is ambiguous<\/code><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6b63\u786e\u5199\u6cd5<\/h3>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT u.id\nFROM user u\nJOIN order o ON u.id = o.user_id;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001\u6570\u636e\u5e93\uff08Schema\uff09\u4e0e\u522b\u540d\u7684\u5173\u7cfb<\/h2>\n\n\n\n<p>\u867d\u7136\u6570\u636e\u5e93\u4e0d\u80fd\u76f4\u63a5\u53d6\u522b\u540d\uff0c\u4f46\u53ef\u4ee5\uff1a<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT *\nFROM shop_db.user u;\n\n<\/pre><\/div>\n\n\n<p>\u5728\u8de8\u5e93\u67e5\u8be2\u65f6\u5f88\u91cd\u8981\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u516b\u3001\u9762\u8bd5\u9ad8\u9891\u603b\u7ed3\uff08\u80cc\u8fd9\u4e2a\u5c31\u591f\uff09<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u2705 \u8868\u522b\u540d\u53ef\u4ee5\u7b80\u5316 SQL\uff0c\u63d0\u9ad8\u53ef\u8bfb\u6027<br>\u2705 \u5b50\u67e5\u8be2\u4f5c\u4e3a\u8868\u5fc5\u987b\u6709\u522b\u540d<br>\u274c WHERE \u4e0d\u80fd\u4f7f\u7528 SELECT \u522b\u540d<br>\u2705 ORDER BY \u53ef\u4ee5\u4f7f\u7528 SELECT \u522b\u540d<br>\u26a0\ufe0f \u591a\u8868\u67e5\u8be2\u5fc5\u987b\u4f7f\u7528\u8868\u522b\u540d\u9632\u6b67\u4e49<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e5d\u3001\u4e00\u4e2a\u7efc\u5408\u793a\u4f8b\uff08\u771f\u5b9e\u9879\u76ee\u7ea7\uff09<\/h2>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: plain; title: ; notranslate\" title=\"\">\nSELECT\n    u.id AS user_id,\n    u.name AS user_name,\n    COUNT(o.id) AS order_count\nFROM user u\nLEFT JOIN orders o ON u.id = o.user_id\nWHERE u.status = 1\nGROUP BY u.id, u.name\nORDER BY order_count DESC;\n\n<\/pre><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u5982\u679c\u4f60\u613f\u610f\uff0c\u6211\u4e5f\u53ef\u4ee5\u5e2e\u4f60\u6574\u7406\u4e00\u4efd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\ud83d\udccc <strong>SQL \u522b\u540d\u901f\u67e5\u8868\uff08\u9762\u8bd5\u7248\uff09<\/strong><\/li>\n\n\n\n<li>\ud83d\udccc <strong>MySQL \/ Oracle \/ PostgreSQL \u522b\u540d\u5dee\u5f02<\/strong><\/li>\n\n\n\n<li>\ud83d\udccc <strong>\u771f\u5b9e\u9879\u76ee\u4e2d\u522b\u540d\u8bbe\u8ba1\u89c4\u8303<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\u4f60\u53ef\u4ee5\u76f4\u63a5\u544a\u8bc9\u6211\u4f60\u662f <strong>\u5b66\u4e60 \/ \u9762\u8bd5 \/ \u5b9e\u6218\u9879\u76ee<\/strong> \u54ea\u79cd\u573a\u666f\uff0c\u6211\u6309\u4f60\u9700\u6c42\u6765 \ud83d\udc4d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e0b\u9762\u6211\u4ece**\u201c\u6570\u636e\u5e93\/\u8868\u522b\u540d\u5982\u4f55\u547d\u540d\u201d\u4ee5\u53ca\u201c\u5e38\u89c1\u67e5\u8be2\u95ee\u9898\u4e0e\u89e3\u6790\u201d**\u4e24\u4e2a\u7ef4\u5ea6\uff0c\u7cfb&#8230; 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