{"id":143783,"date":"2024-11-01T01:12:19","date_gmt":"2024-10-31T17:12:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143783\/"},"modified":"2024-11-01T01:12:20","modified_gmt":"2024-10-31T17:12:20","slug":"sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95%e5%92%8c%e8%aa%9e%e5%8f%a5%e5%88%86%e9%a1%9e%ef%bc%8c%e4%bd%a0%e5%ad%b8%e6%9c%83%e4%ba%86%e5%97%8e%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143783\/","title":{"rendered":"SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u8a9e\u53e5\u5206\u985e\uff0c\u4f60\u5b78\u6703\u4e86\u55ce\uff1f"},"content":{"rendered":"<h1 id=\"sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95%e5%92%8c%e8%aa%9e%e5%8f%a5%e5%88%86%e9%a1%9e%ef%bc%8c%e4%bd%a0%e5%ad%b8%e6%9c%83%e4%ba%86%e5%97%8e%ef%bc%9f-NLggUmUCqc\">SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u8a9e\u53e5\u5206\u985e\uff0c\u4f60\u5b78\u6703\u4e86\u55ce\uff1f<\/h1>\n<p>SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7121\u8ad6\u662f\u6578\u64da\u7684\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u7ba1\u7406\uff0cSQL \u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u4ecb\u7d39 SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u8a9e\u53e5\u5206\u985e\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u4e00\u8a9e\u8a00\u3002<\/p>\n<h2 id=\"sql-%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-NLggUmUCqc\">SQL \u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>SQL \u8a9e\u53e5\u7684\u57fa\u672c\u7d50\u69cb\u901a\u5e38\u5305\u62ec\u95dc\u9375\u5b57\u3001\u8868\u540d\u3001\u5217\u540d\u548c\u689d\u4ef6\u7b49\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u8a9e\u53e5\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>SELECT<\/code> \u662f\u7528\u4f86\u9078\u64c7\u6578\u64da\u7684\u95dc\u9375\u5b57\uff0c<code>FROM<\/code> \u6307\u5b9a\u4e86\u6578\u64da\u4f86\u6e90\u7684\u8868\uff0c<code>WHERE<\/code> \u7528\u65bc\u8a2d\u7f6e\u67e5\u8a62\u689d\u4ef6\u3002<\/p>\n<h2 id=\"sql-%e8%aa%9e%e5%8f%a5%e7%9a%84%e5%88%86%e9%a1%9e-NLggUmUCqc\">SQL \u8a9e\u53e5\u7684\u5206\u985e<\/h2>\n<p>SQL \u8a9e\u53e5\u53ef\u4ee5\u6839\u64da\u5176\u529f\u80fd\u5206\u70ba\u5e7e\u500b\u4e3b\u8981\u985e\u5225\uff1a<\/p>\n<ul>\n<li><strong>\u6578\u64da\u67e5\u8a62\u8a9e\u53e5\uff08DQL\uff09<\/strong><\/li>\n<p>\u6578\u64da\u67e5\u8a62\u8a9e\u53e5\u4e3b\u8981\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u6578\u64da\u3002\u6700\u5e38\u7528\u7684\u8a9e\u53e5\u662f <code>SELECT<\/code>\u3002<\/p>\n<pre><code>SELECT * FROM employees WHERE department = 'Sales';<\/code><\/pre>\n<li><strong>\u6578\u64da\u64cd\u4f5c\u8a9e\u53e5\uff08DML\uff09<\/strong><\/li>\n<p>\u6578\u64da\u64cd\u4f5c\u8a9e\u53e5\u7528\u65bc\u5c0d\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u9032\u884c\u63d2\u5165\u3001\u66f4\u65b0\u548c\u522a\u9664\u64cd\u4f5c\u3002\u4e3b\u8981\u8a9e\u53e5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>INSERT<\/code><\/li>\n<pre><code>INSERT INTO employees (name, department) VALUES ('John Doe', 'Sales');<\/code><\/pre>\n<\/li>\n<li><code>UPDATE<\/code><\/li>\n<pre><code>UPDATE employees SET department = 'Marketing' WHERE name = 'John Doe';<\/code><\/pre>\n<\/li>\n<li><code>DELETE<\/code><\/li>\n<pre><code>DELETE FROM employees WHERE name = 'John Doe';<\/code><\/pre>\n<\/li>\n<\/ul>\n<li><strong>\u6578\u64da\u5b9a\u7fa9\u8a9e\u53e5\uff08DDL\uff09<\/strong><\/li>\n<p>\u6578\u64da\u5b9a\u7fa9\u8a9e\u53e5\u7528\u65bc\u5b9a\u7fa9\u6578\u64da\u5eab\u7d50\u69cb\uff0c\u5305\u62ec\u5275\u5efa\u3001\u4fee\u6539\u548c\u522a\u9664\u8868\u3002\u4e3b\u8981\u8a9e\u53e5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>CREATE TABLE<\/code><\/li>\n<pre><code>CREATE TABLE employees (id INT PRIMARY KEY, name VARCHAR(100), department VARCHAR(50));<\/code><\/pre>\n<\/li>\n<li><code>ALTER TABLE<\/code><\/li>\n<pre><code>ALTER TABLE employees ADD COLUMN salary DECIMAL(10, 2);<\/code><\/pre>\n<\/li>\n<li><code>DROP TABLE<\/code><\/li>\n<pre><code>DROP TABLE employees;<\/code><\/pre>\n<\/li>\n<\/ul>\n<li><strong>\u6578\u64da\u63a7\u5236\u8a9e\u53e5\uff08DCL\uff09<\/strong><\/li>\n<p>\u6578\u64da\u63a7\u5236\u8a9e\u53e5\u7528\u65bc\u63a7\u5236\u5c0d\u6578\u64da\u7684\u8a2a\u554f\u6b0a\u9650\u3002\u4e3b\u8981\u8a9e\u53e5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><code>GRANT<\/code><\/li>\n<pre><code>GRANT SELECT ON employees TO user1;<\/code><\/pre>\n<\/li>\n<li><code>REVOKE<\/code><\/li>\n<pre><code>REVOKE SELECT ON employees FROM user1;<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-NLggUmUCqc\">\u7d50\u8ad6<\/h2>\n<p>\u638c\u63e1 SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u8a9e\u53e5\u5206\u985e\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u64cd\u4f5c\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u67e5\u8a62\u3001\u6578\u64da\u66f4\u65b0\u9084\u662f\u6578\u64da\u7d50\u69cb\u7684\u5b9a\u7fa9\uff0c\u4e86\u89e3\u9019\u4e9b\u57fa\u672c\u6982\u5ff5\u90fd\u80fd\u5e6b\u52a9\u4f60\u66f4\u6709\u6548\u5730\u4f7f\u7528 SQL\u3002\u96a8\u8457\u6280\u8853\u7684\u767c\u5c55\uff0cSQL \u7684\u61c9\u7528\u7bc4\u570d\u4e5f\u5728\u4e0d\u65b7\u64f4\u5927\uff0c\u5b78\u7fd2\u548c\u638c\u63e1 SQL \u5c07\u70ba\u4f60\u7684\u8077\u696d\u751f\u6daf\u589e\u6dfb\u91cd\u8981\u7684\u6280\u80fd\u3002<\/p>\n<p>\u5982\u679c\u4f60\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6709\u66f4\u6df1\u5165\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\u4f86\u642d\u5efa\u4f60\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u4eab\u53d7\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u80fd\u529b\u548c\u9748\u6d3b\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22 SQL \u7684\u57fa\u672c\u8a9e\u6cd5\u548c\u8a9e\u53e5\u5206\u985e\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\uff0c\u63d0\u5347\u4f60\u7684\u6578\u64da\u5eab\u6280\u80fd\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-143783","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143783","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=143783"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143783\/revisions"}],"predecessor-version":[{"id":143784,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143783\/revisions\/143784"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}