{"id":7819,"date":"2023-11-28T19:59:42","date_gmt":"2023-11-28T11:59:42","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=7819"},"modified":"2023-11-28T19:59:59","modified_gmt":"2023-11-28T11:59:59","slug":"mysql-you-na-xie-shu-ju-lei-xing","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/mysql-you-na-xie-shu-ju-lei-xing\/","title":{"rendered":"MySQL\u6709\u54ea\u4e9b\u6570\u636e\u7c7b\u578b\uff1f"},"content":{"rendered":"<p>\u5206\u7c7b\t\u7c7b\u578b\u540d\u79f0\t\u8bf4\u660e<br \/>\n\u6574\u6570\u7c7b\u578b\ttinylnt\t\u5f88\u5c0f\u7684\u6574\u6570(8\u4f4d\u4e8c\u8fdb\u5236)<br \/>\n\u6574\u6570\u7c7b\u578b\tsmallint\t\u5c0f\u7684\u6574\u6570(16\u4f4d\u4e8c\u8fdb\u5236)<br \/>\n\u6574\u6570\u7c7b\u578b\tmediumint\t\u4e2d\u7b49\u5927\u5c0f\u7684\u6574\u6570(24\u4f4d\u4e8c\u8fdb\u5236)<br \/>\n\u6574\u6570\u7c7b\u578b\tint(integer)\t\u666e\u901a\u5927\u5c0f\u7684\u6574\u6570(32\u4f4d\u4e8c\u8fdb\u5236)<br \/>\n\u5c0f\u6570\u7c7b\u578b\tfloat\t\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570<br \/>\n\u5c0f\u6570\u7c7b\u578b\tdouble\t\u53cc\u7cbe\u5ea6\u6d6e\u70b9\u6570<br \/>\n\u5c0f\u6570\u7c7b\u578b\tdecimal(m, d)\t\u538b\u7f29\u4e25\u683c\u7684\u5b9a\u70b9\u6570<\/p>\n<p>YYYY 1901~2155<br \/>\nHH\uff1a MM\uff1a SS -838\uff1a 59\uff1a 59~83\uff1a<br \/>\n59\uff1a 59<br \/>\nYYYY-MM-DD<br \/>\n1000-01-01\uff5e9999-12-3<br \/>\nYYYY-MM-DD HH\uff1a MM\uff1a SS<br \/>\n1000-01-01 00\uff1a 00\uff1a 00~<br \/>\n9999-12-31 23\uff1a 59\uff1a 59<br \/>\nYYYY-MM-DD HH\uff1a MM\uff1a SS<br \/>\n19700101 00\uff1a 00\uff1a 01<br \/>\nUTC2038-01-19 03\uff1a 14\uff1a 07UTC<br \/>\nM\u4e3a0~255\u4e4b\u95f4\u7684\u6574\u6570<br \/>\nM\u4e3a0\uff5e65535\u4e4b\u95f4\u7684\u6574\u6570<br \/>\n\u5141\u8bb8\u957f\u5ea60~255\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60~65535\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea6 0\uff5e167772150\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5e4294967295\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60~255\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5e65535\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5e167772150\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5e4294967295\u5b57\u8282<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5eM\u4e2a\u5b57\u8282\u7684\u53d8\u957f\u5b57<br \/>\n\u8282\u5b57\u7b26\u4e32<br \/>\n\u5141\u8bb8\u957f\u5ea60\uff5eM\u4e2a\u5b57\u8282\u7684\u5b9a\u957f\u5b57 \u8282\u5b57\u7b26\u4e32<br \/>\n\u5305\u62ec TINYINT, SMALLINT, MEDIUMINT. INT\u3001BIGINT,\u5206\u522b\u8868\u793a 1 \u5b57\u8282\u30012 \u5b57\u8282\u30013 \u5b57\u8282\u30014 \u5b57\u8282\u30018\u5b57\u8282\u6574\u6570\u3002\u4efb\u4f55\u6574\u6570\u7c7b\u578b\u90fd\u53ef\u4ee5\u52a0\u4e0aUNSIGNED\u5c5e\u6027\uff0c\u8868\u793a\u6570\u636e\u662f\u65e0\u7b26\u53f7\u7684\uff0c\u5373\u975e\u8d1f\u6574\u6570\u3002<br \/>\n\u957f\u5ea6\uff1a\u6574\u6570\u7c7b\u578b\u53ef\u4ee5\u88ab\u6307\u5b9a\u957f\u5ea6\uff0c\u4f8b\u5982\uff1aINT(11)\u8868\u793a\u957f\u5ea6\u4e3a11\u7684INT\u7c7b\u578b\u3002\u957f\u5ea6\u5728\u5927\u591a\u6570\u573a\u666f\u662f\u6ca1\u6709\u610f\u4e49\u7684\uff0c\u5b83\u4e0d\u4f1a\u9650\u5236\u503c\u7684\u5408\u6cd5\u8303\u56f4\uff0c\u53ea\u4f1a\u5f71\u54cd\u663e\u793a\u5b57\u7b26\u7684\u4e2a\u6570\uff0c\u800c\u4e14\u9700\u8981\u548cUNSIGNED ZEROFILL\u5c5e\u6027\u914d\u5408\u4f7f\u7528\u624d\u6709\u610f\u4e49\u3002<br \/>\n\u4f8b\u5b50\uff1a<br \/>\n\u5047\u5b9a\u7c7b\u578b\u8bbe\u5b9a\u4e3aINT(5),\u5c5e\u6027\u4e3aUNSIGNED ZEROFILL,\u5982\u679c\u7528\u6237\u63d2\u5165\u7684\u6570\u636e\u4e3a12\u7684\u8bdd\uff0c\u90a3\u4e48\u6570\u636e\u5e93\u5b9e\u9645\u5b58\u50a8\u6570\u636e\u4e3a00012\u3002<br \/>\n\u5b9e\u6570\u7c7b\u578b<br \/>\n1\u3001\t\u5305\u62ec FLOAT\u3001DOUBLE. DECIMAL\u3002<br \/>\n2\u3001\tDECIMAL\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u6bd4BIGINT\u8fd8\u5927\u7684\u6574\u578b\uff0c\u80fd\u5b58\u50a8\u7cbe\u786e\u7684\u5c0f\u6570\u3002<br \/>\n3\u3001\t\u800cFLOAT\u548cDOUBLE\u662f\u6709\u53d6\u503c\u8303\u56f4\u7684\uff0c\u5e76\u652f\u6301\u4f7f\u7528\u6807\u51c6\u7684\u6d6e\u70b9\u8fdb\u884c\u8fd1\u4f3c\u8ba1\u7b97\u3002<br \/>\n4\u3001\t\u8ba1\u7b97\u65f6FLOAT\u548cDOUBLE\u76f8\u6bd4DECIMAL\u6548\u7387\u66f4\u9ad8\u4e00\u4e9b\uff0cDECIMAL\u4f60\u53ef\u4ee5\u7406\u89e3\u6210\u662f\u7528\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406\u3002<br \/>\n\u5b57\u7b26\u4e32\u7c7b\u578b<br \/>\n\u5305\u62ec VARCHAR\u3001CHAR\u3001TEXT\u3001BLOB<br \/>\n1\u3001\tVARCHAR\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5b57\u7b26\u4e32\uff0c\u5b83\u6bd4\u5b9a\u957f\u7c7b\u578b\u66f4\u8282\u7701\u7a7a\u95f4\u3002<br \/>\n2\u3001\tVARCHAR\u4f7f\u7528\u989d\u59161\u62162\u4e2a\u5b57\u8282\u5b58\u50a8\u5b57\u7b26\u4e32\u957f\u5ea6\u3002\u5217\u957f\u5ea6\u5c0f\u4e8e255\u5b57\u8282\u65f6\uff0c\u4f7f\u75281\u5b57\u8282\u8868\u793a\uff0c\u5426\u5219\u4f7f\u75282\u5b57\u8282\u8868\u793a\u3002<br \/>\n3\u3001\tVARCHAR\u5b58\u50a8\u7684\u5185\u5bb9\u8d85\u51fa\u8bbe\u7f6e\u7684\u957f\u5ea6\u65f6\uff0c\u5185\u5bb9\u4f1a\u88ab\u622a\u65ad\u3002<br \/>\n4\u3001\tCHAR\u662f\u5b9a\u957f\u7684\uff0c\u6839\u636e\u5b9a\u4e49\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\u5206\u914d\u8db3\u591f\u7684\u7a7a\u95f4\u3002<br \/>\n5\u3001\tCHAR\u4f1a\u6839\u636e\u9700\u8981\u4f7f\u7528\u7a7a\u683c\u8fdb\u884c\u586b\u5145\u65b9\u4fbf\u6bd4\u8f83\u3002<br \/>\n6\u3001\tCHAR\u9002\u5408\u5b58\u50a8\u5f88\u77ed\u7684\u5b57\u7b26\u4e32\uff0c\u6216\u8005\u6240\u6709\u503c\u90fd\u63a5\u8fd1\u540c\u4e00\u4e2a\u957f\u5ea6\u3002<br \/>\n7\u3001\tCHAR\u5b58\u50a8\u7684\u5185\u5bb9\u8d85\u51fa\u8bbe\u7f6e\u7684\u957f\u5ea6\u65f6\uff0c\u5185\u5bb9\u540c\u6837\u4f1a\u88ab\u622a\u65ad\u3002<br \/>\n\u4fbf\u7528\u7b56\u7565\uff1a<br \/>\n1\u3001\t\u5bf9\u4e8e\u7ecf\u5e38\u53d8\u66f4\u7684\u6570\u636e\u6765\u8bf4\uff0cCHAR\u6bd4VARCHAR\u66f4\u597d\uff0c\u56e0\u4e3aCHAR\u4e0d\u5bb9\u6613\u4ea7\u751f\u788e\u7247\u3002<br \/>\n2\u3001\t\u5bf9\u4e8e\u975e\u5e38\u77ed\u7684\u5217\uff0cCHAR\u6bd4VARCHAR\u5728\u5b58\u50a8\u7a7a\u95f4\u4e0a\u66f4\u6709\u6548\u7387\u3002<br \/>\n3\u3001\t\u4f7f\u7528\u65f6\u8981\u6ce8\u610f\u53ea\u5206\u914d\u9700\u8981\u7684\u7a7a\u95f4\uff0c\u66f4\u957f\u7684\u5217\u6392\u5e8f\u65f6\u4f1a\u6d88\u8017\u66f4\u591a\u5185\u5b58\u3002<br \/>\n4\u3001\t\u5c3d\u91cf\u907f\u514d\u4f7f\u7528TEXT\/BLOB\u7c7b\u578b\uff0c\u67e5\u8be2\u65f6\u4f1a\u4f7f\u7528\u4e34\u65f6\u8868\uff0c\u5bfc\u81f4\u4e25\u91cd\u7684\u6027\u80fd\u5f00\u9500\u3002<br \/>\n\u679a\u4e3e\u7c7b\u578b\uff08ENUM\uff09<br \/>\n1\u3001\t\u628a\u4e0d\u91cd\u590d\u7684\u6570\u636e\u5b58\u50a8\u4e3a\u4e00\u4e2a\u9884\u5b9a\u4e49\u7684\u96c6\u5408\u3002<br \/>\n2\u3001\t\u6709\u65f6\u53ef\u4ee5\u4f7f\u7528ENUM\u4ee3\u66ff\u5e38\u7528\u7684\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<br \/>\n3\u3001\tENUM\u5b58\u50a8\u975e\u5e38\u7d27\u51d1\uff0c\u4f1a\u628a\u5217\u8868\u503c\u538b\u7f29\u5230\u4e00\u4e2a\u6216\u4e24\u4e2a\u5b57\u8282\u3002<br \/>\n4\u3001\tENUM\u5728\u5185\u90e8\u5b58\u50a8\u65f6\uff0c\u5176\u5b9e\u5b58\u7684\u662f\u6574\u6570\u3002<br \/>\n5\u3001\t\u5c3d\u91cf\u907f\u514d\u4f7f\u7528\u6570\u5b57\u4f5c\u4e3aENUM\u679a\u4e3e\u7684\u5e38\u91cf\uff0c\u56e0\u4e3a\u5bb9\u6613\u6df7\u4e71\u3002<br \/>\n6\u3001\t\u6392\u5e8f\u662f\u6309\u7167\u5185\u90e8\u5b58\u50a8\u7684\u6574\u6570<br \/>\n\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<br \/>\n1\u3001\t\u5c3d\u91cf\u4f7f\u7528timestamp,\u7a7a\u95f4\u6548\u7387\u9ad8\u4e8edatetime\u3002<br \/>\n2\u3001\t\u7528\u6574\u6570\u4fdd\u5b58\u65f6\u95f4\u6233\u901a\u5e38\u4e0d\u65b9\u4fbf\u5904\u7406\u3002<br \/>\n3\u3001\t\u5982\u679c\u9700\u8981\u5b58\u50a8\u5fae\u5999\uff0c\u53ef\u4ee5\u4f7f\u7528bigint\u5b58\u50a8\u3002<br \/>\n\u770b\u5230\u8fd9\u91cc\uff0c\u8fd9\u9053\u771f\u9898\u662f\u4e0d\u662f\u5c31\u6bd4\u8f83\u5bb9\u6613\u56de\u7b54\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5206\u7c7b \u7c7b\u578b\u540d\u79f0 \u8bf4\u660e \u6574\u6570\u7c7b\u578b tinylnt \u5f88\u5c0f\u7684\u6574\u6570(8\u4f4d\u4e8c\u8fdb\u5236) \u6574\u6570\u7c7b\u578b smallint \u5c0f\u7684\u6574\u6570 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[102],"tags":[],"class_list":["post-7819","post","type-post","status-publish","format-standard","hentry","category-db"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=7819"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7819\/revisions"}],"predecessor-version":[{"id":7821,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/7819\/revisions\/7821"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=7819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=7819"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=7819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}