{"id":45552,"date":"2025-07-30T00:26:07","date_gmt":"2025-07-29T16:26:07","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/45552.html"},"modified":"2025-07-30T00:26:07","modified_gmt":"2025-07-29T16:26:07","slug":"sql%e4%b8%ad%e7%9a%84%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%af%a2","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/45552.html","title":{"rendered":"sql\u4e2d\u7684\u591a\u8868\u67e5\u8be2"},"content":{"rendered":"<p>\u5728SQL\u4e2d&#xff0c;\u591a\u8868\u67e5\u8be2\u7528\u4e8e\u4ece\u591a\u4e2a\u8868\u4e2d\u7ec4\u5408\u6570\u636e&#xff0c;\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec \u200b\u8fde\u63a5\u67e5\u8be2&#xff08;JOIN&#xff09;\u200b\u200b \u548c \u200b\u5b50\u67e5\u8be2\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u8bf4\u660e\u548c\u793a\u4f8b&#xff1a;<\/p>\n<hr \/>\n<h4>\u4e00\u3001\u8fde\u63a5\u67e5\u8be2&#xff08;JOIN&#xff09;<\/h4>\n<p>\u901a\u8fc7\u5173\u8054\u5b57\u6bb5\u5c06\u591a\u4e2a\u8868\u7684\u6570\u636e\u5408\u5e76&#xff0c;\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\u7c7b\u578b&#xff1a;<\/p>\n<p>1. \u5185\u8fde\u63a5&#xff08;INNER JOIN&#xff09;<\/p>\n<ul>\n<li>\u200b\u4f5c\u7528\u200b&#xff1a;\u53ea\u8fd4\u56de\u4e24\u8868\u4e2d\u5339\u914d\u7684\u884c\u3002<\/li>\n<li>\u200b\u8bed\u6cd5\u200b&#xff1a;\n<p>SELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nINNER JOIN \u88682 ON \u88681.\u5173\u8054\u5b57\u6bb5 &#061; \u88682.\u5173\u8054\u5b57\u6bb5;\n<\/li>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\n<p>&#8212; \u67e5\u8be2\u5458\u5de5\u53ca\u5176\u6240\u5c5e\u90e8\u95e8\u4fe1\u606f&#xff08;\u4ec5\u5339\u914d\u7684\u8bb0\u5f55&#xff09;<br \/>\nSELECT e.name, d.department_name<br \/>\nFROM employees e<br \/>\nINNER JOIN departments d ON e.dept_id &#061; d.id;\n<\/li>\n<\/ul>\n<p>2. \u5de6\u5916\u8fde\u63a5&#xff08;LEFT JOIN \/ LEFT OUTER JOIN&#xff09;<\/p>\n<ul>\n<li>\u200b\u4f5c\u7528\u200b&#xff1a;\u8fd4\u56de\u5de6\u8868\u6240\u6709\u884c&#xff0c;\u53f3\u8868\u65e0\u5339\u914d\u5219\u586b\u5145NULL\u3002<\/li>\n<li>\u200b\u8bed\u6cd5\u200b&#xff1a;\n<p>SELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nLEFT JOIN \u88682 ON \u88681.\u5173\u8054\u5b57\u6bb5 &#061; \u88682.\u5173\u8054\u5b57\u6bb5;\n<\/li>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\n<p>&#8212; \u67e5\u8be2\u6240\u6709\u5458\u5de5\u53ca\u90e8\u95e8\u4fe1\u606f&#xff08;\u5305\u62ec\u65e0\u90e8\u95e8\u7684\u5458\u5de5&#xff09;<br \/>\nSELECT e.name, d.department_name<br \/>\nFROM employees e<br \/>\nLEFT JOIN departments d ON e.dept_id &#061; d.id;\n<\/li>\n<\/ul>\n<p>3. \u53f3\u5916\u8fde\u63a5&#xff08;RIGHT JOIN \/ RIGHT OUTER JOIN&#xff09;<\/p>\n<ul>\n<li>\u200b\u4f5c\u7528\u200b&#xff1a;\u8fd4\u56de\u53f3\u8868\u6240\u6709\u884c&#xff0c;\u5de6\u8868\u65e0\u5339\u914d\u5219\u586b\u5145NULL\u3002<\/li>\n<li>\u200b\u8bed\u6cd5\u200b&#xff1a;\n<p>SELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nRIGHT JOIN \u88682 ON \u88681.\u5173\u8054\u5b57\u6bb5 &#061; \u88682.\u5173\u8054\u5b57\u6bb5;\n<\/li>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\n<p>&#8212; \u67e5\u8be2\u6240\u6709\u90e8\u95e8\u53ca\u5458\u5de5\u4fe1\u606f&#xff08;\u5305\u62ec\u65e0\u5458\u5de5\u7684\u90e8\u95e8&#xff09;<br \/>\nSELECT e.name, d.department_name<br \/>\nFROM employees e<br \/>\nRIGHT JOIN departments d ON e.dept_id &#061; d.id;\n<\/li>\n<\/ul>\n<p>4. \u5168\u5916\u8fde\u63a5&#xff08;FULL JOIN \/ FULL OUTER JOIN&#xff09;<\/p>\n<ul>\n<li>\u200b\u4f5c\u7528\u200b&#xff1a;\u8fd4\u56de\u4e24\u8868\u6240\u6709\u884c&#xff0c;\u65e0\u5339\u914d\u5219\u586b\u5145NULL&#xff08;\u90e8\u5206\u6570\u636e\u5e93\u5982MySQL\u4e0d\u76f4\u63a5\u652f\u6301&#xff0c;\u9700\u7528UNION\u6a21\u62df&#xff09;\u3002<\/li>\n<li>\u200b\u8bed\u6cd5\u200b&#xff08;\u4ee5MySQL\u4e3a\u4f8b&#xff09;&#xff1a;\n<p>SELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nLEFT JOIN \u88682 ON \u88681.\u5173\u8054\u5b57\u6bb5 &#061; \u88682.\u5173\u8054\u5b57\u6bb5<br \/>\nUNION<br \/>\nSELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nRIGHT JOIN \u88682 ON \u88681.\u5173\u8054\u5b57\u6bb5 &#061; \u88682.\u5173\u8054\u5b57\u6bb5;\n<\/li>\n<\/ul>\n<p>5. \u4ea4\u53c9\u8fde\u63a5&#xff08;CROSS JOIN&#xff09;<\/p>\n<ul>\n<li>\u200b\u4f5c\u7528\u200b&#xff1a;\u8fd4\u56de\u4e24\u8868\u7684\u7b1b\u5361\u5c14\u79ef&#xff08;\u6240\u6709\u53ef\u80fd\u7684\u7ec4\u5408&#xff09;\u3002<\/li>\n<li>\u200b\u8bed\u6cd5\u200b&#xff1a;\n<p>SELECT \u5217\u540d<br \/>\nFROM \u88681<br \/>\nCROSS JOIN \u88682;\n<\/li>\n<li>\u200b\u6ce8\u610f\u200b&#xff1a;\u7ed3\u679c\u884c\u6570 &#061; \u88681\u884c\u6570 \u00d7 \u88682\u884c\u6570&#xff0c;\u9700\u8c28\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e8c\u3001\u5b50\u67e5\u8be2<\/h4>\n<p>\u5728\u67e5\u8be2\u4e2d\u5d4c\u5957\u53e6\u4e00\u4e2a\u67e5\u8be2&#xff0c;\u5206\u4e3a\u4ee5\u4e0b\u573a\u666f&#xff1a;<\/p>\n<p>1. WHERE\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2<\/p>\n<ul>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\u67e5\u8be2\u5de5\u8d44\u9ad8\u4e8e\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u3002\n<p>SELECT name, salary<br \/>\nFROM employees<br \/>\nWHERE salary &gt; (SELECT AVG(salary) FROM employees);\n<\/li>\n<\/ul>\n<p>2. FROM\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2&#xff08;\u6d3e\u751f\u8868&#xff09;<\/p>\n<ul>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\u5c06\u5b50\u67e5\u8be2\u7ed3\u679c\u4f5c\u4e3a\u4e34\u65f6\u8868\u4f7f\u7528\u3002\n<p>SELECT dept_avg.dept_id, dept_avg.avg_salary<br \/>\nFROM (SELECT dept_id, AVG(salary) AS avg_salary FROM employees GROUP BY dept_id) AS dept_avg<br \/>\nWHERE dept_avg.avg_salary &gt; 5000;\n<\/li>\n<\/ul>\n<p>3. SELECT\u5b50\u53e5\u4e2d\u7684\u5b50\u67e5\u8be2&#xff08;\u6807\u91cf\u5b50\u67e5\u8be2&#xff09;<\/p>\n<ul>\n<li>\u200b\u793a\u4f8b\u200b&#xff1a;\u67e5\u8be2\u5458\u5de5\u59d3\u540d\u53ca\u5176\u90e8\u95e8\u540d\u79f0&#xff08;\u901a\u8fc7\u5b50\u67e5\u8be2\u83b7\u53d6\u90e8\u95e8\u540d&#xff09;\u3002\n<p>SELECT<br \/>\n  e.name,<br \/>\n  (SELECT d.department_name FROM departments d WHERE d.id &#061; e.dept_id) AS department_name<br \/>\nFROM employees e;\n<\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e09\u3001\u591a\u8868\u8fde\u63a5\u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n<li>\u200b\u660e\u786e\u5173\u8054\u5b57\u6bb5\u200b&#xff1a;\u786e\u4fdd\u8fde\u63a5\u6761\u4ef6\u6b63\u786e&#xff0c;\u907f\u514d\u7b1b\u5361\u5c14\u79ef\u3002<\/li>\n<li>\u200b\u6027\u80fd\u4f18\u5316\u200b&#xff1a;\n<ul>\n<li>\u4e3a\u5173\u8054\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n<li>\u907f\u514d\u8fc7\u591a\u7684\u8868\u8fde\u63a5&#xff08;\u4e00\u822c\u4e0d\u8d85\u8fc73-4\u5f20\u8868&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u200b\u7ed3\u679c\u53bb\u91cd\u200b&#xff1a;\u4f7f\u7528DISTINCT\u6d88\u9664\u91cd\u590d\u884c&#xff08;\u5982\u591a\u8868\u8fde\u63a5\u5bfc\u81f4\u91cd\u590d&#xff09;\u3002<\/li>\n<hr \/>\n<h4>\u56db\u3001\u5b9e\u9645\u6848\u4f8b<\/h4>\n<p>\u200b\u573a\u666f\u200b&#xff1a;\u67e5\u8be2\u201c\u9500\u552e\u90e8\u95e8\u201d\u7684\u6240\u6709\u5458\u5de5\u59d3\u540d\u53ca\u5176\u804c\u4f4d\u3002<\/p>\n<p>&#8212; \u65b9\u6cd51&#xff1a;\u5185\u8fde\u63a5<br \/>\nSELECT e.name, e.position<br \/>\nFROM employees e<br \/>\nINNER JOIN departments d ON e.dept_id &#061; d.id<br \/>\nWHERE d.department_name &#061; &#039;\u9500\u552e\u90e8&#039;;<\/p>\n<p>&#8212; \u65b9\u6cd52&#xff1a;\u5b50\u67e5\u8be2<br \/>\nSELECT name, position<br \/>\nFROM employees<br \/>\nWHERE dept_id &#061; (SELECT id FROM departments WHERE department_name &#061; &#039;\u9500\u552e\u90e8&#039;);<\/p>\n<hr \/>\n<p>\u901a\u8fc7\u7075\u6d3b\u7ec4\u5408\u8fde\u63a5\u548c\u5b50\u67e5\u8be2&#xff0c;\u53ef\u4ee5\u9ad8\u6548\u5904\u7406\u590d\u6742\u7684\u6570\u636e\u5173\u8054\u9700\u6c42\u3002\u6839\u636e\u573a\u666f\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5&#xff0c;\u5e76\u6ce8\u610f\u6027\u80fd\u4f18\u5316&#xff01;<\/p>\n<p>\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb883\u6b21\uff0c\u70b9\u8d5e16\u6b21\uff0c\u6536\u85cf5\u6b21\u3002\u5728SQL\u4e2d\uff0c\u591a\u8868\u67e5\u8be2\u7528\u4e8e\u4ece\u591a\u4e2a\u8868\u4e2d\u7ec4\u5408\u6570\u636e\uff0c\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec \u200b\u200b \u548c \u200b\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[768,100],"topic":[],"class_list":["post-45552","post","type-post","status-publish","format-standard","hentry","category-server","tag-sql","tag-100"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - 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