{"id":164129,"date":"2024-11-05T05:16:23","date_gmt":"2024-11-04T21:16:23","guid":{"rendered":"https:\/\/server.hk\/cnblog\/164129\/"},"modified":"2024-11-05T05:16:24","modified_gmt":"2024-11-04T21:16:24","slug":"%e4%bb%8b%e7%b4%b9%e5%85%ad%e5%80%8b%e6%9c%89%e7%94%a8%e7%9a%84mysql%e7%9a%84sql%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/164129\/","title":{"rendered":"\u4ecb\u7d39\u516d\u500b\u6709\u7528\u7684MySQL\u7684SQL\u8a9e\u53e5"},"content":{"rendered":"<h1 id=\"%e4%bb%8b%e7%b4%b9%e5%85%ad%e5%80%8b%e6%9c%89%e7%94%a8%e7%9a%84mysql%e7%9a%84sql%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">\u4ecb\u7d39\u516d\u500b\u6709\u7528\u7684MySQL\u7684SQL\u8a9e\u53e5<\/h1>\n<p>MySQL\u662f\u4e00\u7a2e\u6d41\u884c\u7684\u958b\u6e90\u95dc\u806f\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u7db2\u7ad9\u548c\u61c9\u7528\u7a0b\u5e8f\u4e2d\u3002\u7121\u8ad6\u662f\u958b\u767c\u8005\u9084\u662f\u6578\u64da\u5206\u6790\u5e2b\uff0c\u638c\u63e1\u4e00\u4e9b\u57fa\u672c\u7684SQL\u8a9e\u53e5\u90fd\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u516d\u500b\u6709\u7528\u7684MySQL SQL\u8a9e\u53e5\uff0c\u5e6b\u52a9\u60a8\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002<\/p>\n<h2 id=\"1-select-%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">1. SELECT \u8a9e\u53e5<\/h2>\n<p>SELECT\u8a9e\u53e5\u662f\u7528\u65bc\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u6578\u64da\u7684\u57fa\u672c\u8a9e\u53e5\u3002\u5b83\u53ef\u4ee5\u9078\u64c7\u7279\u5b9a\u7684\u5217\u6216\u6574\u500b\u8868\u7684\u6578\u64da\u3002<\/p>\n<pre><code>SELECT column1, column2 FROM table_name;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u5f9e\u540d\u70ba\u201cusers\u201d\u7684\u8868\u4e2d\u9078\u64c7\u201cusername\u201d\u548c\u201cemail\u201d\u5169\u500b\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT username, email FROM users;<\/code><\/pre>\n<h2 id=\"2-where-%e5%ad%90%e5%8f%a5-nQAyEDPUSx\">2. WHERE \u5b50\u53e5<\/h2>\n<p>WHERE\u5b50\u53e5\u7528\u65bc\u904e\u6ffe\u67e5\u8a62\u7d50\u679c\uff0c\u50c5\u8fd4\u56de\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u8a18\u9304\u3002<\/p>\n<pre><code>SELECT column1, column2 FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u5e74\u9f61\u5927\u65bc30\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<h2 id=\"3-insert-into-%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">3. INSERT INTO \u8a9e\u53e5<\/h2>\n<p>INSERT INTO\u8a9e\u53e5\u7528\u65bc\u5411\u8868\u4e2d\u63d2\u5165\u65b0\u8a18\u9304\u3002\u9019\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u975e\u5e38\u5e38\u898b\u7684\u4e00\u500b\u8a9e\u53e5\u3002<\/p>\n<pre><code>INSERT INTO table_name (column1, column2) VALUES (value1, value2);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5411\u201cusers\u201d\u8868\u4e2d\u63d2\u5165\u4e00\u500b\u65b0\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>INSERT INTO users (username, email, age) VALUES ('john_doe', 'john@example.com', 28);<\/code><\/pre>\n<h2 id=\"4-update-%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">4. UPDATE \u8a9e\u53e5<\/h2>\n<p>UPDATE\u8a9e\u53e5\u7528\u65bc\u4fee\u6539\u5df2\u5b58\u5728\u7684\u8a18\u9304\u3002\u9019\u5c0d\u65bc\u4fdd\u6301\u6578\u64da\u7684\u6e96\u78ba\u6027\u548c\u6700\u65b0\u6027\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<pre><code>UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u66f4\u65b0\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>UPDATE users SET email = 'john_new@example.com' WHERE username = 'john_doe';<\/code><\/pre>\n<h2 id=\"5-delete-%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">5. DELETE \u8a9e\u53e5<\/h2>\n<p>DELETE\u8a9e\u53e5\u7528\u65bc\u522a\u9664\u8868\u4e2d\u7684\u8a18\u9304\u3002\u4f7f\u7528\u6642\u9700\u8b39\u614e\uff0c\u4ee5\u514d\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002<\/p>\n<pre><code>DELETE FROM table_name WHERE condition;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u522a\u9664\u7528\u6236\u540d\u70ba\u201cjohn_doe\u201d\u7684\u7528\u6236\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>DELETE FROM users WHERE username = 'john_doe';<\/code><\/pre>\n<h2 id=\"6-join-%e8%aa%9e%e5%8f%a5-nQAyEDPUSx\">6. JOIN \u8a9e\u53e5<\/h2>\n<p>JOIN\u8a9e\u53e5\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\uff0c\u6839\u64da\u76f8\u95dc\u5217\u5c07\u5b83\u5011\u9023\u63a5\u8d77\u4f86\u3002\u9019\u5c0d\u65bc\u8655\u7406\u8907\u96dc\u7684\u6578\u64da\u7d50\u69cb\u975e\u5e38\u6709\u7528\u3002<\/p>\n<pre><code>SELECT columns FROM table1 JOIN table2 ON table1.common_column = table2.common_column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u7528\u6236\u53ca\u5176\u8a02\u55ae\u4fe1\u606f\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SELECT users.username, orders.order_id FROM users JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-nQAyEDPUSx\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1\u9019\u516d\u500b\u57fa\u672c\u7684MySQL SQL\u8a9e\u53e5\uff0c\u60a8\u5c07\u80fd\u5920\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u67e5\u8a62\u6578\u64da\u3002\u7121\u8ad6\u60a8\u662f\u958b\u767c\u8005\u9084\u662f\u6578\u64da\u5206\u6790\u5e2b\uff0c\u9019\u4e9b\u8a9e\u53e5\u90fd\u662f\u65e5\u5e38\u5de5\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u5982\u679c\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>\u6216<a href=\"https:\/\/server.hk\">\u4e91\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\u548c\u6578\u64da\u5eab\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u516d\u500b\u5be6\u7528\u7684MySQL SQL\u8a9e\u53e5\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u548c\u64cd\u4f5c\uff0c\u52a9\u4f60\u8f15\u9b06\u638c\u63e1\u6578\u64da\u5eab\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-164129","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164129","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=164129"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164129\/revisions"}],"predecessor-version":[{"id":164130,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/164129\/revisions\/164130"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=164129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=164129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=164129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}