{"id":152651,"date":"2024-11-02T00:53:21","date_gmt":"2024-11-01T16:53:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152651\/"},"modified":"2024-11-02T00:53:23","modified_gmt":"2024-11-01T16:53:23","slug":"%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152651\/","title":{"rendered":"\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5"},"content":{"rendered":"<h1 id=\"%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5-qPAUkVYhab\">\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u4e86\u89e3\u8868\u7684\u7d50\u69cb\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u7121\u8ad6\u662f\u9032\u884c\u8cc7\u6599\u5206\u6790\u3001\u7dad\u8b77\u8cc7\u6599\u5eab\uff0c\u9084\u662f\u958b\u767c\u61c9\u7528\u7a0b\u5f0f\uff0c\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5\u90fd\u80fd\u63d0\u4f9b\u5fc5\u8981\u7684\u8cc7\u8a0a\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u67e5\u8a62\u8cc7\u6599\u5eab\u4e2d\u7684\u8868\u7d50\u69cb\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u7bc4\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%a1%a8%e7%b5%90%e6%a7%8b%ef%bc%9f-qPAUkVYhab\">\u4ec0\u9ebc\u662f\u8868\u7d50\u69cb\uff1f<\/h2>\n<p>\u8868\u7d50\u69cb\u662f\u6307\u8cc7\u6599\u5eab\u4e2d\u8868\u7684\u8a2d\u8a08\uff0c\u5305\u62ec\u6b04\u4f4d\u540d\u7a31\u3001\u8cc7\u6599\u985e\u578b\u3001\u7d04\u675f\u689d\u4ef6\u7b49\u3002\u900f\u904e\u67e5\u8a62\u8868\u7d50\u69cb\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u4e86\u89e3\u8868\u4e2d\u5b58\u5132\u7684\u8cc7\u6599\u985e\u578b\u53ca\u5176\u7d44\u7e54\u65b9\u5f0f\uff0c\u9019\u5c0d\u65bc\u8cc7\u6599\u7684\u64cd\u4f5c\u548c\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84-sql-%e8%aa%9e%e5%8f%a5-qPAUkVYhab\">\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5<\/h2>\n<p>\u4e0d\u540c\u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u63d0\u4f9b\u4e86\u4e0d\u540c\u7684\u65b9\u5f0f\u4f86\u67e5\u8a62\u8868\u7d50\u69cb\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u8cc7\u6599\u5eab\u7cfb\u7d71\u53ca\u5176\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5\uff1a<\/p>\n<h3 id=\"1-mysql-qPAUkVYhab\">1. MySQL<\/h3>\n<p>\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>DESCRIBE \u8868\u540d;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u8981\u67e5\u8a62\u540d\u70ba `users` \u7684\u8868\u7d50\u69cb\uff0c\u53ef\u4ee5\u57f7\u884c\uff1a<\/p>\n<pre><code>DESCRIBE users;<\/code><\/pre>\n<p>\u9019\u5c07\u8fd4\u56de\u8868\u4e2d\u6240\u6709\u6b04\u4f4d\u7684\u540d\u7a31\u3001\u8cc7\u6599\u985e\u578b\u3001\u662f\u5426\u53ef\u4ee5\u70ba NULL\u3001\u9375\u985e\u578b\u3001\u9810\u8a2d\u503c\u7b49\u8cc7\u8a0a\u3002<\/p>\n<h3 id=\"2-postgresql-qPAUkVYhab\">2. PostgreSQL<\/h3>\n<p>\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, is_nullable, column_default \nFROM information_schema.columns \nWHERE table_name = '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `users` \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, is_nullable, column_default \nFROM information_schema.columns \nWHERE table_name = 'users';<\/code><\/pre>\n<h3 id=\"3-sql-server-qPAUkVYhab\">3. SQL Server<\/h3>\n<p>\u5728 SQL Server \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>EXEC sp_help '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `users` \u8868\u7684\u7d50\u69cb\uff1a<\/p>\n<pre><code>EXEC sp_help 'users';<\/code><\/pre>\n<h3 id=\"4-oracle-qPAUkVYhab\">4. Oracle<\/h3>\n<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u4f86\u67e5\u8a62\u8868\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length, nullable \nFROM user_tab_columns \nWHERE table_name = '\u8868\u540d';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u67e5\u8a62 `USERS` \u8868\u7684\u7d50\u69cb\uff08\u6ce8\u610f\uff1aOracle \u4e2d\u7684\u8868\u540d\u901a\u5e38\u662f\u5927\u5beb\uff09\uff1a<\/p>\n<pre><code>SELECT column_name, data_type, data_length, nullable \nFROM user_tab_columns \nWHERE table_name = 'USERS';<\/code><\/pre>\n<h2 id=\"%e6%9f%a5%e8%a9%a2%e8%a1%a8%e7%b5%90%e6%a7%8b%e7%9a%84%e6%87%89%e7%94%a8-qPAUkVYhab\">\u67e5\u8a62\u8868\u7d50\u69cb\u7684\u61c9\u7528<\/h2>\n<p>\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5\u5728\u591a\u7a2e\u60c5\u5883\u4e0b\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li>\u5728\u9032\u884c\u8cc7\u6599\u9077\u79fb\u6642\uff0c\u4e86\u89e3\u539f\u59cb\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u53ef\u4ee5\u5e6b\u52a9\u8a2d\u8a08\u65b0\u7684\u8cc7\u6599\u8868\u3002<\/li>\n<li>\u5728\u958b\u767c\u61c9\u7528\u7a0b\u5f0f\u6642\uff0c\u958b\u767c\u8005\u9700\u8981\u4e86\u89e3\u8cc7\u6599\u8868\u7684\u7d50\u69cb\u4ee5\u4fbf\u6b63\u78ba\u5730\u9032\u884c\u8cc7\u6599\u64cd\u4f5c\u3002<\/li>\n<li>\u5728\u9032\u884c\u8cc7\u6599\u5eab\u7dad\u8b77\u6642\uff0c\u67e5\u8a62\u8868\u7d50\u69cb\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u6f5b\u5728\u7684\u554f\u984c\uff0c\u4f8b\u5982\u4e0d\u4e00\u81f4\u7684\u8cc7\u6599\u985e\u578b\u6216\u7f3a\u5931\u7684\u7d04\u675f\u689d\u4ef6\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qPAUkVYhab\">\u7e3d\u7d50<\/h2>\n<p>\u67e5\u8a62\u8868\u7d50\u69cb\u7684 SQL \u8a9e\u53e5\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u4f7f\u7528 MySQL\u3001PostgreSQL\u3001SQL Server \u9084\u662f Oracle\uff0c\u4e86\u89e3\u5982\u4f55\u67e5\u8a62\u8868\u7d50\u69cb\u90fd\u80fd\u5e6b\u52a9\u4f7f\u7528\u8005\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u8cc7\u6599\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u900f\u904e Server.HK \u63d0\u4f9b\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\uff0c\u7528\u6236\u53ef\u4ee5\u7372\u5f97\u512a\u8cea\u7684\u670d\u52d9\u548c\u652f\u6301\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u8cc7\u6599\u5eab\u7684\u904b\u884c\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u4f7f\u7528 SQL \u8a9e\u53e5\u67e5\u8a62\u8868\u7d50\u69cb\uff0c\u8f15\u9b06\u7372\u53d6\u8cc7\u6599\u5eab\u4e2d\u8868\u7684\u6b04\u4f4d\u3001\u985e\u578b\u53ca\u7d04\u675f\u8cc7\u8a0a\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-152651","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152651","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=152651"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152651\/revisions"}],"predecessor-version":[{"id":152652,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152651\/revisions\/152652"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152651"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152651"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152651"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}