{"id":168461,"date":"2024-11-06T12:34:27","date_gmt":"2024-11-06T04:34:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168461\/"},"modified":"2024-11-06T12:34:27","modified_gmt":"2024-11-06T04:34:27","slug":"sql-%e8%aa%9e%e5%8f%a5%e7%9b%b8%e9%97%9c%e6%a6%82%e5%bf%b5%e5%8f%8a%e7%b7%b4%e7%bf%92%e4%b9%8b%e5%9f%ba%e7%a4%8e%e7%af%87","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168461\/","title":{"rendered":"SQL \u8a9e\u53e5\u76f8\u95dc\u6982\u5ff5\u53ca\u7df4\u7fd2\u4e4b\u57fa\u790e\u7bc7"},"content":{"rendered":"<h1 id=\"sql-%e8%aa%9e%e5%8f%a5%e7%9b%b8%e9%97%9c%e6%a6%82%e5%bf%b5%e5%8f%8a%e7%b7%b4%e7%bf%92%e4%b9%8b%e5%9f%ba%e7%a4%8e%e7%af%87-WeWmgwWccR\">SQL \u8a9e\u53e5\u76f8\u95dc\u6982\u5ff5\u53ca\u7df4\u7fd2\u4e4b\u57fa\u790e\u7bc7<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u6210\u70ba\u4e86\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u958b\u767c\u8005\u3001\u6578\u64da\u5206\u6790\u5e2b\u9084\u662f\u7cfb\u7d71\u7ba1\u7406\u54e1\uff0c\u638c\u63e1 SQL \u8a9e\u53e5\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u6280\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39 SQL \u7684\u57fa\u672c\u6982\u5ff5\u53ca\u5176\u5e38\u7528\u8a9e\u53e5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u7df4\u7fd2\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u904b\u7528 SQL\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-sql%ef%bc%9f-WeWmgwWccR\">\u4ec0\u9ebc\u662f SQL\uff1f<\/h2>\n<p>SQL\uff08Structured Query Language\uff09\u662f\u4e00\u7a2e\u5c08\u9580\u7528\u65bc\u7ba1\u7406\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u7de8\u7a0b\u8a9e\u8a00\u3002\u5b83\u5141\u8a31\u7528\u6236\u57f7\u884c\u5404\u7a2e\u64cd\u4f5c\uff0c\u5305\u62ec\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u6578\u64da\u3001\u63d2\u5165\u6578\u64da\u548c\u522a\u9664\u6578\u64da\u3002SQL \u7684\u8a9e\u6cd5\u7c21\u55ae\u660e\u77ad\uff0c\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u8f15\u9b06\u5730\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u3002<\/p>\n<h2 id=\"sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-WeWmgwWccR\">SQL \u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u5eab\uff08Database\uff09<\/strong>\uff1a\u4e00\u500b\u6709\u7d44\u7e54\u7684\u6578\u64da\u96c6\u5408\uff0c\u901a\u5e38\u7531\u591a\u500b\u8868\u7d44\u6210\u3002<\/li>\n<li><strong>\u8868\uff08Table\uff09<\/strong>\uff1a\u6578\u64da\u5eab\u4e2d\u7684\u57fa\u672c\u7d50\u69cb\uff0c\u6578\u64da\u4ee5\u884c\u548c\u5217\u7684\u5f62\u5f0f\u5b58\u5132\u3002<\/li>\n<li><strong>\u884c\uff08Row\uff09<\/strong>\uff1a\u8868\u4e2d\u7684\u4e00\u689d\u8a18\u9304\uff0c\u5305\u542b\u591a\u500b\u5b57\u6bb5\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u5217\uff08Column\uff09<\/strong>\uff1a\u8868\u4e2d\u7684\u4e00\u500b\u5b57\u6bb5\uff0c\u5b9a\u7fa9\u4e86\u6578\u64da\u7684\u985e\u578b\u548c\u5c6c\u6027\u3002<\/li>\n<li><strong>\u4e3b\u9375\uff08Primary Key\uff09<\/strong>\uff1a\u552f\u4e00\u6a19\u8b58\u8868\u4e2d\u6bcf\u4e00\u884c\u7684\u5b57\u6bb5\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u552f\u4e00\u6027\u3002<\/li>\n<li><strong>\u5916\u9375\uff08Foreign Key\uff09<\/strong>\uff1a\u7528\u65bc\u5efa\u7acb\u8868\u4e4b\u9593\u95dc\u806f\u7684\u5b57\u6bb5\uff0c\u901a\u5e38\u6307\u5411\u53e6\u4e00\u500b\u8868\u7684\u4e3b\u9375\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5-WeWmgwWccR\">\u5e38\u7528\u7684 SQL \u8a9e\u53e5<\/h2>\n<h3 id=\"1-select-%e8%aa%9e%e5%8f%a5-WeWmgwWccR\">1. SELECT \u8a9e\u53e5<\/h3>\n<p>SELECT \u8a9e\u53e5\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62\u540d\u70ba &#8220;employees&#8221; \u7684\u8868\u4e2d\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u8077\u4f4d\uff1a<\/p>\n<pre><code>SELECT name, position FROM employees;<\/code><\/pre>\n<h3 id=\"2-insert-%e8%aa%9e%e5%8f%a5-WeWmgwWccR\">2. INSERT \u8a9e\u53e5<\/h3>\n<p>INSERT \u8a9e\u53e5\u7528\u65bc\u5411\u8868\u4e2d\u63d2\u5165\u65b0\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>INSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5411 &#8220;employees&#8221; \u8868\u4e2d\u63d2\u5165\u4e00\u540d\u65b0\u54e1\u5de5\u7684\u6578\u64da\uff1a<\/p>\n<pre><code>INSERT INTO employees (name, position) VALUES ('John Doe', 'Developer');<\/code><\/pre>\n<h3 id=\"3-update-%e8%aa%9e%e5%8f%a5-WeWmgwWccR\">3. UPDATE \u8a9e\u53e5<\/h3>\n<p>UPDATE \u8a9e\u53e5\u7528\u65bc\u66f4\u65b0\u8868\u4e2d\u5df2\u6709\u7684\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>UPDATE table_name SET column1 = value1 WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5c07 &#8220;employees&#8221; \u8868\u4e2d\u540d\u70ba &#8220;John Doe&#8221; \u7684\u54e1\u5de5\u7684\u8077\u4f4d\u66f4\u65b0\u70ba &#8220;Senior Developer&#8221;\uff1a<\/p>\n<pre><code>UPDATE employees SET position = 'Senior Developer' WHERE name = 'John Doe';<\/code><\/pre>\n<h3 id=\"4-delete-%e8%aa%9e%e5%8f%a5-WeWmgwWccR\">4. DELETE \u8a9e\u53e5<\/h3>\n<p>DELETE \u8a9e\u53e5\u7528\u65bc\u522a\u9664\u8868\u4e2d\u7684\u6578\u64da\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>DELETE FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u522a\u9664 &#8220;employees&#8221; \u8868\u4e2d\u540d\u70ba &#8220;John Doe&#8221; \u7684\u54e1\u5de5\uff1a<\/p>\n<pre><code>DELETE FROM employees WHERE name = 'John Doe';<\/code><\/pre>\n<h2 id=\"sql-%e8%aa%9e%e5%8f%a5%e7%b7%b4%e7%bf%92-WeWmgwWccR\">SQL \u8a9e\u53e5\u7df4\u7fd2<\/h2>\n<p>\u70ba\u4e86\u52a0\u6df1\u5c0d SQL \u8a9e\u53e5\u7684\u7406\u89e3\uff0c\u5efa\u8b70\u8b80\u8005\u9032\u884c\u4ee5\u4e0b\u7df4\u7fd2\uff1a<\/p>\n<ul>\n<li>\u5275\u5efa\u4e00\u500b\u540d\u70ba &#8220;products&#8221; \u7684\u8868\uff0c\u5305\u542b &#8220;id&#8221;\u3001&#8221;name&#8221; \u548c &#8220;price&#8221; \u4e09\u500b\u5b57\u6bb5\u3002<\/li>\n<li>\u5411 &#8220;products&#8221; \u8868\u4e2d\u63d2\u5165\u81f3\u5c11\u4e94\u689d\u7522\u54c1\u6578\u64da\u3002<\/li>\n<li>\u67e5\u8a62\u6240\u6709\u7522\u54c1\u7684\u540d\u7a31\u548c\u50f9\u683c\u3002<\/li>\n<li>\u66f4\u65b0\u67d0\u4e00\u7522\u54c1\u7684\u50f9\u683c\u3002<\/li>\n<li>\u522a\u9664\u67d0\u4e00\u7522\u54c1\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-WeWmgwWccR\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 SQL \u8a9e\u53e5\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u57fa\u790e\uff0c\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u522a\u9664\uff0cSQL \u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\u3002\u900f\u904e\u4e0d\u65b7\u7684\u7df4\u7fd2\u548c\u5be6\u8e10\uff0c\u8b80\u8005\u5c07\u80fd\u5920\u719f\u7df4\u904b\u7528 SQL \u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002\u82e5\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u7ba1\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u8a9e\u53e5\u7684\u57fa\u672c\u6982\u5ff5\u8207\u7df4\u7fd2\uff0c\u638c\u63e1\u8cc7\u6599\u5eab\u64cd\u4f5c\u7684\u57fa\u790e\u77e5\u8b58\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u7ba1\u7406\u6280\u80fd\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-168461","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168461","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=168461"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168461\/revisions"}],"predecessor-version":[{"id":168462,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168461\/revisions\/168462"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168461"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168461"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168461"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}