{"id":5735,"date":"2024-11-14T10:03:14","date_gmt":"2024-11-14T02:03:14","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5735\/"},"modified":"2024-11-14T10:03:14","modified_gmt":"2024-11-14T02:03:14","slug":"sql%e5%ad%97%e6%ae%b5%e9%95%bf%e5%ba%a6%e6%80%8e%e4%b9%88%e8%ae%be%e7%bd%ae","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5735\/","title":{"rendered":"sql\u5b57\u6bb5\u957f\u5ea6\u600e\u4e48\u8bbe\u7f6e"},"content":{"rendered":"<blockquote><p>\n  sql \u5b57\u6bb5\u957f\u5ea6\u8bbe\u7f6e\u51b3\u5b9a\u4e86\u5b57\u6bb5\u5bb9\u7eb3\u7684\u5b57\u7b26\u6570\u91cf\uff0c\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd\u548c\u5b58\u50a8\u6548\u7387\u3002\u8bbe\u7f6e\u65f6\u9700\u8003\u8651\u6570\u636e\u7c7b\u578b\u3001\u9884\u671f\u6570\u636e\u3001\u5b58\u50a8\u7a7a\u95f4\u548c\u7d22\u5f15\u6027\u80fd\u3002\u4e0d\u540c\u6570\u636e\u5e93\u7cfb\u7edf\u6709\u4e0d\u540c\u8bed\u6cd5\uff0c\u5982 mysql \u4f7f\u7528 int(\u957f\u5ea6) \u548c varchar(\u957f\u5ea6)\uff0cpostgresql \u4f7f\u7528 int4 \u548c varchar(\u957f\u5ea6)\u3002\u6700\u4f73\u5b9e\u8df5\u5305\u62ec\u9009\u62e9\u9002\u5f53\u7c7b\u578b\u4ee5\u5339\u914d\u6574\u6570\u8303\u56f4\uff0c\u4f7f\u7528 varchar \u8bbe\u7f6e\u5408\u7406\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\uff0c\u907f\u514d\u4f7f\u7528\u5927\u578b\u6570\u636e\u7c7b\u578b\uff0c\u5e76\u5b9a\u671f\u5ba1\u67e5\u548c\u8c03\u6574\u957f\u5ea6\u4ee5\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/30\/2024053021392760900.jpg\" class=\"aligncenter\" title=\"sql\u5b57\u6bb5\u957f\u5ea6\u600e\u4e48\u8bbe\u7f6e\u63d2\u56fe\" alt=\"sql\u5b57\u6bb5\u957f\u5ea6\u600e\u4e48\u8bbe\u7f6e\u63d2\u56fe\" \/><\/p>\n<p><strong>SQL \u5b57\u6bb5\u957f\u5ea6\u8bbe\u7f6e<\/strong><\/p>\n<p>SQL \u5b57\u6bb5\u7684\u957f\u5ea6\u8bbe\u7f6e\u51b3\u5b9a\u4e86\u8be5\u5b57\u6bb5\u53ef\u4ee5\u5bb9\u7eb3\u591a\u5c11\u4e2a\u5b57\u7b26\u3002\u5408\u7406\u7684\u8bbe\u7f6e\u5b57\u6bb5\u957f\u5ea6\u5bf9\u4e8e\u6570\u636e\u5e93\u7684\u6027\u80fd\u548c\u5b58\u50a8\u6548\u7387\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<p><strong>\u5982\u4f55\u8bbe\u7f6e\u5b57\u6bb5\u957f\u5ea6<\/strong><\/p>\n<p>\u8bbe\u7f6e\u5b57\u6bb5\u957f\u5ea6\u65f6\uff0c\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li> <strong>\u6570\u636e\u7c7b\u578b\uff1a<\/strong>\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u5177\u6709\u4e0d\u540c\u7684\u957f\u5ea6\u9650\u5236\u3002\u4f8b\u5982\uff0cINT \u7c7b\u578b\u53ea\u80fd\u5b58\u50a8\u6574\u6570\uff0c\u800c VARCHAR \u7c7b\u578b\u53ef\u4ee5\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u4e32\u3002<\/li>\n<li> <strong>\u9884\u671f\u6570\u636e\uff1a<\/strong>\u4f30\u8ba1\u5b57\u6bb5\u53ef\u80fd\u5bb9\u7eb3\u7684\u6700\u5927\u6570\u636e\u91cf\u3002\u6839\u636e\u6b64\u4f30\u8ba1\u503c\u8bbe\u7f6e\u5b57\u6bb5\u957f\u5ea6\uff0c\u53ef\u4ee5\u907f\u514d\u6570\u636e\u622a\u65ad\u3002<\/li>\n<li> <strong>\u5b58\u50a8\u7a7a\u95f4\uff1a<\/strong>\u8f83\u957f\u7684\u5b57\u6bb5\u9700\u8981\u66f4\u591a\u7684\u5b58\u50a8\u7a7a\u95f4\u3002\u5982\u679c\u5b57\u6bb5\u957f\u5ea6\u8bbe\u7f6e\u8fc7\u5927\uff0c\u5219\u4f1a\u6d6a\u8d39\u5b58\u50a8\u7a7a\u95f4\u3002<\/li>\n<li> <strong>\u7d22\u5f15\u6027\u80fd\uff1a<\/strong>\u8f83\u77ed\u7684\u5b57\u6bb5\u53ef\u4ee5\u521b\u5efa\u66f4\u6709\u6548\u7684\u7d22\u5f15\uff0c\u4ece\u800c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n<\/ul>\n<p><strong>\u5177\u4f53\u8bbe\u7f6e\u65b9\u6cd5<\/strong><\/p>\n<p>\u4e0d\u540c\u7684 SQL \u6570\u636e\u5e93\u7cfb\u7edf\u6709\u4e0d\u540c\u7684\u8bed\u6cd5\u7528\u4e8e\u8bbe\u7f6e\u5b57\u6bb5\u957f\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u8bed\u6cd5\uff1a<\/p>\n<ul>\n<li> <strong>MySQL\uff1a<\/strong>INT(\u957f\u5ea6)\u3001VARCHAR(\u957f\u5ea6)\u3001TEXT<\/li>\n<li> <strong>PostgreSQL\uff1a<\/strong>INT4\u3001VARCHAR(\u957f\u5ea6)<\/li>\n<li> <strong>Oracle\uff1a<\/strong>NUMBER(\u7cbe\u5ea6, \u6807\u5ea6)\u3001VARCHAR2(\u957f\u5ea6)<\/li>\n<\/ul>\n<p><strong>\u6700\u4f73\u5b9e\u8df5<\/strong><\/p>\n<ul>\n<li>\u5bf9\u4e8e\u6574\u6570\uff0c\u9009\u62e9\u5408\u9002\u7684\u7c7b\u578b\uff08TINYINT\u3001SMALLINT\u3001INT\u3001BIGINT\uff09\uff0c\u4ee5\u5339\u914d\u9884\u671f\u7684\u6570\u636e\u8303\u56f4\u3002<\/li>\n<li>\u5bf9\u4e8e\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528 VARCHAR \u7c7b\u578b\u5e76\u6839\u636e\u9884\u671f\u6570\u636e\u957f\u5ea6\u8bbe\u7f6e\u5408\u7406\u7684\u957f\u5ea6\u3002<\/li>\n<li>\u907f\u514d\u4f7f\u7528 TEXT \u6216 LONGTEXT \u7b49\u5927\u578b\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/li>\n<li>\u5b9a\u671f\u5ba1\u67e5\u5b57\u6bb5\u957f\u5ea6\u5e76\u6839\u636e\u9700\u8981\u8fdb\u884c\u8c03\u6574\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fsql\u5b57\u6bb5\u957f\u5ea6\u600e\u4e48\u8bbe\u7f6e\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>sql 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PostgreSQL\uff1aINT4\u3001VARCHAR(\u957f\u5ea6) Oracle\uff1aNUMBER(\u7cbe\u5ea6, \u6807\u5ea6)\u3001VARCHAR2(\u957f\u5ea6) \u6700\u4f73\u5b9e\u8df5 \u5bf9\u4e8e\u6574\u6570\uff0c\u9009\u62e9\u5408\u9002\u7684\u7c7b\u578b\uff08TINYINT\u3001SMALLINT\u3001INT\u3001BIGINT\uff09\uff0c\u4ee5\u5339\u914d\u9884\u671f\u7684\u6570\u636e\u8303\u56f4\u3002 \u5bf9\u4e8e\u5b57\u7b26\u4e32\uff0c\u4f7f\u7528 VARCHAR \u7c7b\u578b\u5e76\u6839\u636e\u9884\u671f\u6570\u636e\u957f\u5ea6\u8bbe\u7f6e\u5408\u7406\u7684\u957f\u5ea6\u3002 \u907f\u514d\u4f7f\u7528 TEXT \u6216 LONGTEXT \u7b49\u5927\u578b\u6570\u636e\u7c7b\u578b\uff0c\u56e0\u4e3a\u5b83\u4eec\u53ef\u80fd\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002 \u5b9a\u671f\u5ba1\u67e5\u5b57\u6bb5\u957f\u5ea6\u5e76\u6839\u636e\u9700\u8981\u8fdb\u884c\u8c03\u6574\uff0c\u4ee5\u786e\u4fdd\u6570\u636e\u5b8c\u6574\u6027\u548c\u5b58\u50a8\u6548\u7387\u3002 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