{"id":186694,"date":"2024-11-11T08:03:25","date_gmt":"2024-11-11T00:03:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186694\/"},"modified":"2024-11-11T08:03:27","modified_gmt":"2024-11-11T00:03:27","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%9f%ba%ef%bc%9asql%e8%aa%9e%e5%8f%a5%e5%a4%a7%e5%85%a8-30%e5%ad%97%e4%b8%ad%e6%96%87%e6%96%87%e7%ab%a0%e6%a8%99%e9%a1%8c-%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186694\/","title":{"rendered":"\u6578\u64da\u5eab\u57fa\uff1aSQL\u8a9e\u53e5\u5927\u5168\u2014\u201430\u5b57\u4e2d\u6587\u6587\u7ae0\u6a19\u984c (\u6578\u64da\u5eab\u57fa \u2014sql\u8a9e\u53e5\u5927\u5168)"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e5%9f%ba%ef%bc%9asql%e8%aa%9e%e5%8f%a5%e5%a4%a7%e5%85%a8-MAsDttpfse\">\u6578\u64da\u5eab\u57fa\uff1aSQL\u8a9e\u53e5\u5927\u5168<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u626e\u6f14\u8457\u81f3\u95dc\u91cd\u8981\u7684\u89d2\u8272\u3002SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u9032\u884c\u4ea4\u4e92\u7684\u4e3b\u8981\u8a9e\u8a00\u4e4b\u4e00\u3002\u7121\u8ad6\u662f\u67e5\u8a62\u6578\u64da\u3001\u66f4\u65b0\u8a18\u9304\u9084\u662f\u7ba1\u7406\u6578\u64da\u5eab\u7d50\u69cb\uff0cSQL\u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u4e00\u4e9b\u5e38\u7528\u7684SQL\u8a9e\u53e5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u4f7f\u7528\u9019\u7a2e\u8a9e\u8a00\u3002<\/p>\n<h2 id=\"1-%e5%9f%ba%e6%9c%acsql%e8%aa%9e%e5%8f%a5-MAsDttpfse\">1. \u57fa\u672cSQL\u8a9e\u53e5<\/h2>\n<h3 id=\"1-1-select-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">1.1 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;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5f9e\u201cusers\u201d\u8868\u4e2d\u9078\u64c7\u201cname\u201d\u548c\u201cemail\u201d\u6b04\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>SELECT name, email FROM users;<\/code><\/pre>\n<h3 id=\"1-2-insert-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">1.2 INSERT \u8a9e\u53e5<\/h3>\n<p>INSERT\u8a9e\u53e5\u7528\u65bc\u5411\u6578\u64da\u5eab\u4e2d\u63d2\u5165\u65b0\u8a18\u9304\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\u201cusers\u201d\u8868\u4e2d\u63d2\u5165\u4e00\u689d\u65b0\u8a18\u9304\uff1a<\/p>\n<pre><code>INSERT INTO users (name, email) VALUES ('John Doe', 'john@example.com');<\/code><\/pre>\n<h3 id=\"1-3-update-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">1.3 UPDATE \u8a9e\u53e5<\/h3>\n<p>UPDATE\u8a9e\u53e5\u7528\u65bc\u66f4\u65b0\u6578\u64da\u5eab\u4e2d\u7684\u73fe\u6709\u8a18\u9304\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\u66f4\u65b0\u201cusers\u201d\u8868\u4e2d\u67d0\u500b\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\uff1a<\/p>\n<pre><code>UPDATE users SET email = 'john.doe@example.com' WHERE name = 'John Doe';<\/code><\/pre>\n<h3 id=\"1-4-delete-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">1.4 DELETE \u8a9e\u53e5<\/h3>\n<p>DELETE\u8a9e\u53e5\u7528\u65bc\u522a\u9664\u6578\u64da\u5eab\u4e2d\u7684\u8a18\u9304\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\u201cusers\u201d\u8868\u4e2d\u540d\u70ba\u201cJohn Doe\u201d\u7684\u7528\u6236\uff1a<\/p>\n<pre><code>DELETE FROM users WHERE name = 'John Doe';<\/code><\/pre>\n<h2 id=\"2-%e9%ab%98%e7%b4%9asql%e8%aa%9e%e5%8f%a5-MAsDttpfse\">2. \u9ad8\u7d1aSQL\u8a9e\u53e5<\/h2>\n<h3 id=\"2-1-join-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">2.1 JOIN \u8a9e\u53e5<\/h3>\n<p>JOIN\u8a9e\u53e5\u7528\u65bc\u5f9e\u591a\u500b\u8868\u4e2d\u67e5\u8a62\u6578\u64da\u3002\u6700\u5e38\u898b\u7684JOIN\u985e\u578b\u5305\u62ecINNER JOIN\u3001LEFT JOIN\u548cRIGHT JOIN\u3002\u4ee5\u4e0b\u662fINNER JOIN\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5f9e\u201cusers\u201d\u548c\u201corders\u201d\u8868\u4e2d\u67e5\u8a62\u7528\u6236\u53ca\u5176\u8a02\u55ae\uff1a<\/p>\n<pre><code>SELECT users.name, orders.order_id FROM users INNER JOIN orders ON users.id = orders.user_id;<\/code><\/pre>\n<h3 id=\"2-2-group-by-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">2.2 GROUP BY \u8a9e\u53e5<\/h3>\n<p>GROUP BY\u8a9e\u53e5\u7528\u65bc\u5c07\u67e5\u8a62\u7d50\u679c\u6309\u6307\u5b9a\u6b04\u4f4d\u5206\u7d44\uff0c\u901a\u5e38\u8207\u805a\u5408\u51fd\u6578\uff08\u5982COUNT\u3001SUM\u3001AVG\u7b49\uff09\u4e00\u8d77\u4f7f\u7528\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column, COUNT(*) FROM table_name GROUP BY column;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62\u6bcf\u500b\u7528\u6236\u7684\u8a02\u55ae\u6578\u91cf\uff1a<\/p>\n<pre><code>SELECT user_id, COUNT(*) FROM orders GROUP BY user_id;<\/code><\/pre>\n<h3 id=\"2-3-order-by-%e8%aa%9e%e5%8f%a5-MAsDttpfse\">2.3 ORDER BY \u8a9e\u53e5<\/h3>\n<p>ORDER BY\u8a9e\u53e5\u7528\u65bc\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT columns FROM table_name ORDER BY column ASC|DESC;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u6309\u7528\u6236\u540d\u7684\u5b57\u6bcd\u9806\u5e8f\u6392\u5e8f\uff1a<\/p>\n<pre><code>SELECT * FROM users ORDER BY name ASC;<\/code><\/pre>\n<h2 id=\"3-sql%e8%aa%9e%e5%8f%a5%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-MAsDttpfse\">3. SQL\u8a9e\u53e5\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<ul>\n<li><strong>\u4f7f\u7528\u53c3\u6578\u5316\u67e5\u8a62\uff1a<\/strong>\u907f\u514dSQL\u6ce8\u5165\u653b\u64ca\uff0c\u78ba\u4fdd\u6578\u64da\u5b89\u5168\u3002<\/li>\n<li><strong>\u5b9a\u671f\u5099\u4efd\u6578\u64da\uff1a<\/strong>\u9632\u6b62\u6578\u64da\u4e1f\u5931\uff0c\u78ba\u4fdd\u696d\u52d9\u9023\u7e8c\u6027\u3002<\/li>\n<li><strong>\u512a\u5316\u67e5\u8a62\u6027\u80fd\uff1a<\/strong>\u4f7f\u7528\u7d22\u5f15\u548c\u9069\u7576\u7684\u67e5\u8a62\u7d50\u69cb\u4f86\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-MAsDttpfse\">\u7e3d\u7d50<\/h2>\n<p>SQL\u8a9e\u8a00\u662f\u6578\u64da\u5eab\u7ba1\u7406\u7684\u57fa\u77f3\uff0c\u638c\u63e1\u5176\u57fa\u672c\u548c\u9ad8\u7d1a\u8a9e\u53e5\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u7121\u8ad6\u662f\u9032\u884c\u7c21\u55ae\u7684\u6578\u64da\u67e5\u8a62\u9084\u662f\u8907\u96dc\u7684\u6578\u64da\u64cd\u4f5c\uff0c\u4e86\u89e3SQL\u7684\u8a9e\u6cd5\u548c\u6700\u4f73\u5be6\u8e10\u90fd\u80fd\u5e6b\u52a9\u7528\u6236\u66f4\u6709\u6548\u5730\u4f7f\u7528\u6578\u64da\u5eab\u3002\u82e5\u60a8\u9700\u8981\u9ad8\u6548\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u696d\u52d9\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u57fa\u7684SQL\u8a9e\u53e5\u5927\u5168\uff0c\u6db5\u84cb\u5e38\u7528\u67e5\u8a62\u3001\u66f4\u65b0\u53ca\u7ba1\u7406\u6280\u5de7\uff0c\u52a9\u4f60\u8f15\u9b06\u638c\u63e1\u6578\u64da\u5eab\u64cd\u4f5c\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-186694","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186694","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=186694"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186694\/revisions"}],"predecessor-version":[{"id":186695,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186694\/revisions\/186695"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186694"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186694"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186694"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}