{"id":100,"date":"2010-05-20T19:53:14","date_gmt":"2010-05-20T19:53:14","guid":{"rendered":"f899139df5e1059396431415e770c6dd"},"modified":"2010-05-20T19:53:14","modified_gmt":"2010-05-20T19:53:14","slug":"","status":"publish","type":"post","link":"https:\/\/www.xiaobo.li\/notes\/archives\/100","title":{"rendered":"mysql \u6570\u636e\u7c7b\u578b"},"content":{"rendered":"

MySQL\u5217\u7c7b\u578b\u5206\u4e3a3\u5927\u7c7b\uff1a\u6570\u503c\u7c7b\u578b\u3001\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\n

 <\/p>\n

\u4e00\u3001\u6570\u503c\u7c7b\u578b<\/strong><\/p>\n

\u5982\u65e0\u7279\u522b\u8bf4\u660e<\/span> \uff0c<\/span> <\/span> M<\/span> <\/em> <\/span> \u8868\u793a\u6700\u5927\u663e\u793a\u5bbd\u5ea6\u3002\u6700\u5927\u6709\u6548\u663e\u793a\u5bbd\u5ea6\u662f255<\/span> \u3002\u663e\u793a\u5bbd\u5ea6\u4e0e\u5b58\u50a8\u5927\u5c0f\u6216\u7c7b\u578b\u5305\u542b\u7684\u503c\u7684\u8303\u56f4\u65e0\u5173\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5b9a\u4e49<\/strong><\/td>\n\u5b58\u50a8\u9700\u6c42<\/strong><\/td>\n\u6570\u636e\u8303\u56f4<\/strong><\/td>\n\u8bf4\u660e<\/strong><\/td>\n<\/tr>\n
\u65e0\u7b26\u53f7<\/strong><\/td>\n\u6709\u7b26\u53f7<\/strong><\/td>\n<\/tr>\n
BIT[(M<\/em> )]<\/span><\/td>\n\u7ea6(<\/span> M<\/span> <\/em> <\/span> +7)\/8B<\/span> <\/td>\n <\/td>\n <\/td>\n\u4f4d\u5b57\u6bb5\u7c7b\u578b\u3002M<\/span> <\/em> <\/span> \u8868\u793a\u6bcf\u4e2a\u503c\u7684\u4f4d\u6570\uff0c\u8303\u56f4\u4e3a\u4ece1<\/span> \u523064\uff1b<\/span> M<\/span> <\/em> <\/span> \u9ed8\u8ba4\u503c\u4e3a1<\/span> \u3002<\/td>\n<\/tr>\n
TINYINT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n1B<\/span><\/td>\n\n0<\/span> ~255<\/span> <\/td>\n\n-128<\/span> ~127<\/span> <\/td>\n\u5f88\u5c0f\u7684\u6574\u6570\u3002<\/td>\n<\/tr>\n
\nBOOL<\/span> \uff0cBOOLEAN<\/span> <\/td>\n <\/td>\n <\/td>\n <\/td>\n\nTINYINT(1)<\/span> \u7684\u540c\u4e49\u8bcd\u3002zero<\/span> \u503c\u4e3afalse\uff1b\u975ezero<\/span> \u503c\u4e3atrue\u3002<\/td>\n<\/tr>\n
SMALLINT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n2B<\/span><\/td>\n\n0<\/span> ~65535<\/span> <\/td>\n\n-32768<\/span> ~32767<\/span> <\/td>\n\u5c0f\u7684\u6574\u6570\u3002<\/td>\n<\/tr>\n
MEDIUMINT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n3B<\/span><\/td>\n\n0<\/span> ~16777215<\/span> <\/td>\n\n-8388608<\/span> ~8388607<\/span> <\/td>\n\u4e2d\u7b49\u5927\u5c0f\u7684\u6574\u6570\u3002<\/td>\n<\/tr>\n
INT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n4B<\/td>\n\n0<\/span> ~4294967295<\/span> <\/td>\n\n-2147483648<\/span> ~2147483647<\/span> <\/td>\n\u666e\u901a\u5927\u5c0f\u7684\u6574\u6570\u3002<\/td>\n<\/tr>\n
INTEGER[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n <\/td>\n <\/td>\n <\/td>\n\nINT<\/span> \u7684\u540c\u4e49\u8bcd\u3002<\/td>\n<\/tr>\n
BIGINT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n8B<\/td>\n\n0<\/span> ~18446744073709551615<\/span> <\/td>\n\n-9223372036854775808<\/span> ~9223372036854775807<\/span> <\/td>\n\u5927\u6574\u6570\u3002<\/td>\n<\/tr>\n
FLOAT[(M<\/em> ,D<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n4B<\/td>\n\n1.175494351E-38<\/span> ~3.402823466E+38<\/span> <\/td>\n\n-3.402823466E+38<\/span> ~-1.175494351E-38<\/span> \u30010<\/span> <\/td>\n\u5c0f(<\/span> \u5355\u7cbe\u5ea6)<\/span> \u6d6e\u70b9\u6570\u3002 M<\/span> <\/em> <\/span> \u662f\u5c0f\u6570\u7eb5\u4f4d\u6570\uff0cD<\/span> <\/em> <\/span> \u662f\u5c0f\u6570\u70b9\u540e\u9762\u7684\u4f4d\u6570\u3002\u5982\u679cM<\/span> <\/em> <\/span> \u548cD<\/span> <\/em> <\/span> \u88ab\u7701\u7565\uff0c\u6839\u636e\u786c\u4ef6\u5141\u8bb8\u7684\u9650\u5236\u6765\u4fdd\u5b58\u503c\u3002\u5355\u7cbe\u5ea6\u6d6e\u70b9\u6570\u7cbe\u786e\u5230\u5927\u7ea67<\/span> \u4f4d\u5c0f\u6570\u4f4d\u3002<\/td>\n<\/tr>\n
DOUBLE[(M<\/em> ,D<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n8B<\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
\nDOUBLE PRECISION[(M<\/em> ,D<\/em> )] [UNSIGNED] [ZEROFILL]<\/span> , <\/span> REAL[(M<\/em> ,D<\/em> )] [UNSIGNED] [ZEROFILL]<\/span> <\/td>\n <\/td>\n <\/td>\n <\/td>\n\nDOUBLE<\/span> \u7684\u540c\u4e49\u8bcd\u3002<\/td>\n<\/tr>\n
FLOAT(p<\/em> ) [UNSIGNED] [ZEROFILL]<\/span><\/td>\n\u5982\u679c0 <= <\/span> p<\/span> <\/em> <\/span> <= 24<\/span> \u4e3a4<\/span> B, <\/span> \u5982\u679c25 <= <\/span> p<\/span> <\/em> <\/span> <= 53<\/span> \u4e3a8<\/span> B<\/td>\n <\/td>\n <\/td>\n\u6d6e\u70b9\u6570\u3002p<\/span> <\/em> <\/span> \u8868\u793a\u7cbe\u5ea6\uff08\u4ee5\u4f4d\u6570\u8868\u793a\uff09\uff0c\u4f46MySQL<\/span> \u53ea\u4f7f\u7528\u8be5\u503c\u6765\u786e\u5b9a\u662f\u5426\u7ed3\u679c\u5217\u7684\u6570\u636e\u7c7b\u578b\u4e3aFLOAT<\/span> \u6216DOUBLE<\/span> \u3002\u5982\u679cp<\/span> <\/em> <\/span> \u4e3a\u4ece0<\/span> \u523024<\/span> \uff0c\u6570\u636e\u7c7b\u578b\u53d8\u4e3a\u6ca1\u6709M<\/span> <\/em> <\/span> \u6216D<\/span> <\/em> <\/span> \u503c\u7684FLOAT<\/span> \u3002\u5982\u679cp<\/span> <\/em> <\/span> \u4e3a\u4ece25<\/span> \u523053<\/span> \uff0c\u6570\u636e\u7c7b\u578b\u53d8\u4e3a\u6ca1\u6709M<\/span> <\/em> <\/span> \u6216D<\/span> <\/em> <\/span> \u503c\u7684DOUBLE<\/span> \u3002\u7ed3\u679c\u5217\u8303\u56f4\u4e0e\u672c\u8282\u524d\u9762\u63cf\u8ff0\u7684\u5355\u7cbe\u5ea6FLOAT<\/span> \u6216\u53cc\u7cbe\u5ea6DOUBLE<\/span> \u6570\u636e\u7c7b\u578b\u76f8\u540c\u3002<\/td>\n<\/tr>\n
DECIMAL[(M<\/em> [,D<\/em> ])] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n\u53d8\u957f<\/td>\n <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
\nDEC[(M<\/em> [,D<\/em> ])] [UNSIGNED] [ZEROFILL]<\/span> , <\/span> NUMERIC[(M<\/em> [,D<\/em> ])] [UNSIGNED] [ZEROFILL]<\/span> , <\/span> FIXED[(M<\/em> [,D<\/em> ])] [UNSIGNED] [ZEROFILL]<\/span> <\/td>\n <\/td>\n <\/td>\n <\/td>\n\nDECIMAL<\/span> \u7684\u540c\u4e49\u8bcd\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u4e8c\u3001\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b<\/strong><\/p>\n

 <\/p>\n\n\n\n\n\n\n\n\n
\u5b9a\u4e49<\/strong><\/td>\n\n

\u5b58\u50a8\u9700\u6c42<\/span> <\/strong><\/p>\n<\/td>\n

\u652f\u6301\u7684\u8303\u56f4<\/strong><\/td>\n\n

\u201c<\/span> <\/strong> \u96f6<\/strong> <\/span> \u201d\u503c<\/span> <\/strong><\/p>\n<\/td>\n

\u8bf4\u660e<\/strong><\/td>\n<\/tr>\n
DATETIME<\/span><\/td>\n8B<\/td>\n\n'1000-01-01 00:00:00'<\/span> ~ '9999-12-31 23:59:59'<\/span> <\/td>\n\n

'0000-00-00 00:00:00'<\/span><\/p>\n<\/td>\n

\n

\u540c\u65f6\u5305\u542b\u65e5\u671f\u548c\u65f6\u95f4\u4fe1\u606f\uff1b<\/p>\n

\u5141\u8bb8\u4fdd\u5b58\u65e5\/<\/span> \u6708\u548c\u65e5\u662f\u96f6\u7684\u65e5\u671f\u3002<\/p>\n<\/td>\n<\/tr>\n

DATE<\/span> <\/span><\/td>\n3B<\/td>\n\n'1000-01-01' ~<\/span> '9999-12-31'<\/span> <\/td>\n\n

'0000-00-00'<\/span><\/p>\n<\/td>\n

\n

\u4ec5\u65e5\u671f\u503c\uff1b<\/p>\n

\u5141\u8bb8\u4fdd\u5b58\u65e5\/<\/span> \u6708\u548c\u65e5\u662f\u96f6\u7684\u65e5\u671f\u3002<\/p>\n<\/td>\n<\/tr>\n

TIMESTAMP<\/span><\/td>\n4B<\/td>\n\u4e0d\u80fd\u65e9\u4e8e1970<\/span> \u6216\u665a\u4e8e2037<\/span> <\/td>\n\n

00000000000000<\/span><\/p>\n<\/td>\n

\u5217\u7c7b\u578b\u7684\u5c5e\u6027\u4e0d\u56fa\u5b9a\uff0c\u53d6\u51b3\u4e8eMySQL<\/span> \u7248\u672c\u548c\u670d\u52a1\u5668\u8fd0\u884c\u7684SQL<\/span> \u6a21\u5f0f\u3002<\/td>\n<\/tr>\n
TIME<\/span><\/td>\n3B<\/td>\n\n'-838:59:59'<\/span> ~ '838:59:59'<\/span> <\/td>\n\n

'00:00:00'<\/span><\/p>\n<\/td>\n

\n

\u4ee5'HH:MM:SS'<\/span> \u683c\u5f0f\u68c0\u7d22\u548c\u663e\u793aTIME<\/span> \u503c\u3002<\/p>\n

\u65e0\u6548TIME<\/span> \u503c\u88ab\u8f6c\u6362\u4e3a'00:00:00'\u3002<\/span><\/p>\n<\/td>\n<\/tr>\n

YEAR<\/span><\/td>\n1B<\/td>\n\n1901<\/span> ~ 2155<\/span> <\/td>\n\n

0000<\/span><\/p>\n<\/td>\n

\n

\u8868\u793a\u5e74\u3002<\/p>\n

\u5355\u5b57\u8282\u7c7b\u578b\u3002<\/p>\n

\u4ee5YYYY<\/span> \u683c\u5f0f\u68c0\u7d22\u548c\u663e\u793aYEAR<\/span> \u503c\u3002<\/p>\n

\u975e\u6cd5YEAR<\/span> \u503c\u88ab\u8f6c\u6362\u4e3a0000<\/span> \u3002<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

1. \u6bcf\u4e2a\u65f6\u95f4\u7c7b\u578b\u6709\u4e00\u4e2a\u6709\u6548\u503c\u8303\u56f4\u548c\u4e00\u4e2a\u201c\u96f6<\/span> \u201d\u503c\uff0c\u5f53\u6307\u5b9a\u4e0d\u5408\u6cd5\u7684MySQL<\/span> \u4e0d\u80fd\u8868\u793a\u7684\u503c\u65f6\u4f7f\u7528\u201c\u96f6<\/span> \u201d\u503c\u3002
\n     \u5982\u679c\u4e0d\u60f3\u5728\u65e5\u671f\u4e2d\u51fa\u73b0\u96f6\uff0c\u53ef\u4ee5\u4f7f\u7528NO_ZERO_IN_DATE<\/span> SQL<\/span> \u6a21\u5f0f\u3002
\n 2. \u5982\u679c\u8bd5\u56fe\u63d2\u5165\u4e00\u4e2a\u4e0d\u5408\u6cd5\u7684\u65e5\u671f\uff0cMySQL<\/span> \u5c06\u7ed9\u51fa\u8b66\u544a\u6216\u9519\u8bef\u3002
\n 3. \u53ef\u4ee5\u4f7f\u7528ALLOW_INVALID_DATES SQL<\/span> \u6a21\u5f0f\u8ba9MySQL<\/span> \u63a5\u53d7\u67d0\u4e9b\u65e5\u671f\u3002
\n 4. \u5141\u8bb8\u5c06'0000-00-00'<\/span> \u4fdd\u5b58\u4e3a\u201c\u4f2a\u65e5\u671f\u201d(<\/span> \u5982\u679c\u4e0d\u4f7f\u7528NO_ZERO_DATE<\/span> SQL<\/span> \u6a21\u5f0f)<\/span> \uff0c\u8fd9\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u6bd4\u4f7f\u7528NULL<\/span> \u503c\u66f4\u65b9\u4fbf(<\/span> \u5e76\u4e14\u6570\u636e\u548c\u7d22\u5f15\u5360\u7528\u7684\u7a7a\u95f4\u66f4\u5c0f)<\/span> \u3002<\/p>\n

 <\/p>\n

5. \u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u5e38\u89c1\u683c\u5f0f\u6307\u5b9aDATETIME<\/span> \u3001DATE<\/span> <\/span> <\/span> \u548cTIMESTAMP<\/span> \u503c\uff1a
\n<\/span><\/p>\n

'YYYY-MM-DD HH:MM:SS'<\/span> \u6216'YY-MM-DD HH:MM:SS'<\/span> \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

'YYYY-MM-DD'<\/span> \u6216'YY-MM-DD'<\/span> \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

'YYYYMMDDHHMMSS'<\/span> \u6216'YYMMDDHHMMSS'<\/span> \u683c\u5f0f\u7684\u6ca1\u6709\u95f4\u5272\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

'YYYYMMDD'<\/span> \u6216'YYMMDD'<\/span> \u683c\u5f0f\u7684\u6ca1\u6709\u95f4\u5272\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

YYYYMMDDHHMMSS<\/span> \u6216YYMMDDHHMMSS<\/span> \u683c\u5f0f\u7684\u6570\u5b57\u3002<\/p>\n

YYYYMMDD<\/span> \u6216YYMMDD<\/span> \u683c\u5f0f\u7684\u6570\u5b57\u3002<\/p>\n

\u65e0\u6548DATETIME<\/span> \u3001DATE<\/span> \u6216\u8005TIMESTAMP<\/span> \u503c\u88ab\u8f6c\u6362\u4e3a\u76f8\u5e94\u7c7b\u578b\u7684\u201c\u96f6<\/span> \u201d\u503c\u3002<\/p>\n

 <\/p>\n

6. \u53ef\u4ee5\u7528\u5404\u79cd\u683c\u5f0f\u6307\u5b9aTIME<\/span> \u503c\uff1a<\/p>\n

'D HH:MM:SS.fraction'<\/span> \u683c\u5f0f\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

'HHMMSS'<\/span> \u683c\u5f0f\u7684\u6ca1\u6709\u95f4\u5272\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n

HHMMSS<\/span> \u683c\u5f0f\u7684\u6570\u503c\u3002<\/p>\n

\u8d85\u51faTIME<\/span> \u8303\u56f4\u4f46\u5408\u6cd5\u7684\u503c\u88ab\u88c1\u4e3a\u8303\u56f4\u6700\u63a5\u8fd1\u7684\u7aef\u70b9\u3002<\/p>\n

 <\/p>\n

\u4e09\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u5b9a\u4e49<\/strong><\/td>\n\n

\u5b58\u50a8\u9700\u6c42<\/span> <\/strong><\/p>\n<\/td>\n

\u957f\u5ea6<\/strong><\/td>\n\u5b58\u50a8\uff08\u503c\uff09<\/strong><\/td>\n\u8bf4\u660e<\/strong><\/td>\n<\/tr>\n
\n

CHAR(M<\/em> )<\/span><\/p>\n<\/td>\n

\n

M<\/span> <\/em> <\/span> \u4e2a\u5b57\u8282\uff0c0 <\/span> <= M<\/em> <=<\/span> 255<\/span><\/p>\n<\/td>\n

\n

\u5217\u957f\u5ea6\u56fa\u5b9a\u4e3a\u521b\u5efa\u8868\u65f6\u58f0\u660e\u7684\u957f\u5ea6\u3002<\/p>\n

\u957f\u5ea6\u53ef\u4ee5\u4e3a\u4ece0<\/span> \u5230255<\/span> \u7684\u4efb\u4f55\u503c\u3002<\/p>\n<\/td>\n

\n

 <\/p>\n

\u5f53\u4fdd\u5b58CHAR<\/span> \u503c\u65f6\uff0c\u5728\u5b83\u4eec\u7684\u53f3\u8fb9\u586b\u5145\u7a7a\u683c\u4ee5\u8fbe\u5230\u6307\u5b9a\u7684\u957f\u5ea6\u3002<\/p>\n<\/td>\n

\n

\u58f0\u660e\u7684\u957f\u5ea6\u8868\u793a\u4f60\u60f3\u8981\u4fdd\u5b58\u7684\u6700\u5927\u5b57\u7b26\u6570\u3002<\/p>\n

\u5f53\u68c0\u7d22\u5230CHAR<\/span> \u503c\u65f6\uff0c\u5c3e\u90e8\u7684\u7a7a\u683c\u88ab\u5220\u9664\u6389\u3002<\/p>\n

\u5728\u5b58\u50a8\u6216\u68c0\u7d22\u8fc7\u7a0b\u4e2d\u4e0d\u8fdb\u884c\u5927\u5c0f\u5199\u8f6c\u6362\u3002<\/p>\n<\/td>\n<\/tr>\n

\n

VARCHAR(M<\/em> )<\/span><\/p>\n<\/td>\n

\nL<\/span> <\/em> <\/span> +1<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <= M <\/em> <\/span> <\/span> \u4e140 <\/span> <= M<\/em> <=<\/span> 65535<\/span> <\/td>\n\n

\u5217\u4e2d\u7684\u503c\u4e3a\u53ef\u53d8\u957f\u5b57\u7b26\u4e32\u3002<\/p>\n

\u957f\u5ea6\u53ef\u4ee5\u6307\u5b9a\u4e3a0<\/span> \u523065,535<\/span> \u4e4b\u95f4\u7684\u503c\u3002<\/p>\n<\/td>\n

\n<\/p>\n

\u503c\u4fdd\u5b58\u65f6\u4e0d\u8fdb\u884c\u586b\u5145\uff0c\u53ea\u4fdd\u5b58\u9700\u8981\u7684\u5b57\u7b26\u6570\uff0c\u53e6\u52a0\u4e00\u4e2a\u5b57\u8282\u6765\u8bb0\u5f55\u957f\u5ea6(<\/span> \u5982\u679c\u5217\u58f0\u660e\u7684\u957f\u5ea6\u8d85\u8fc7255<\/span> \uff0c\u5219\u4f7f\u7528\u4e24\u4e2a\u5b57\u8282)<\/span> \u3002<\/p>\n<\/td>\n

\n

\u58f0\u660e\u7684\u957f\u5ea6\u8868\u793a\u4f60\u60f3\u8981\u4fdd\u5b58\u7684\u6700\u5927\u5b57\u7b26\u6570\u3002<\/p>\n<\/td>\n<\/tr>\n

\n

BINARY(M<\/em> )<\/span><\/p>\n<\/td>\n

\n

M<\/span> <\/em> <\/span> \u4e2a\u5b57\u8282\uff0c0 <\/span> <= M<\/em> <=<\/span> 255<\/span><\/p>\n<\/td>\n

\u957f\u5ea6\u662f\u5b57\u8282\u957f\u5ea6\u3002<\/td>\n\n

\u4fdd\u5b58BINARY<\/span> \u503c\u65f6\uff0c\u5728\u5b83\u4eec\u53f3\u8fb9\u586b\u5145\u503c\u4ee5\u8fbe\u5230\u6307\u5b9a\u957f\u5ea6\u3002<\/p>\n<\/td>\n

\n

\u5b58\u50a8\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u3002<\/p>\n

\u63d2\u5165\u503c\u65f6\u5728\u53f3\u4fa7\u6dfb\u52a00x00<\/span> on<\/span> \uff0c\u5e76\u4e14\u9009\u62e9\u65f6\u4e0d\u5220\u9664\u5c3e\u90e8\u7684\u5b57\u8282\u3002<\/p>\n

\u6bd4\u8f83\u65f6\u6240\u6709\u5b57\u8282\u5f88\u91cd\u8981\uff0c\u5305\u62ecORDER BY<\/span> \u548cDISTINCT<\/span> \u64cd\u4f5c\u3002<\/p>\n<\/td>\n<\/tr>\n

\n

VARBINARY(M<\/em> )<\/span><\/p>\n<\/td>\n

\n

L<\/span> <\/em> <\/span> +1<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <= M <\/em> <\/span> <\/span> \u4e140 <\/span> <= M<\/em> <=<\/span> 255<\/span><\/p>\n<\/td>\n

\u957f\u5ea6\u662f\u5b57\u8282\u957f\u5ea6\u3002<\/td>\n\n

 <\/p>\n<\/td>\n

\n

\u5b58\u50a8\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32\u3002<\/p>\n

\u63d2\u5165\u65f6\u4e0d\u586b\u5145\u5b57\u7b26\uff0c\u9009\u62e9\u65f6\u4e0d\u88c1\u526a\u5b57\u8282\u3002<\/p>\n

\u6bd4\u8f83\u65f6\u6240\u6709\u5b57\u8282\u5f88\u91cd\u8981\uff0c\u5305\u62ecORDER BY<\/span> \u548cDISTINCT<\/span> \u64cd\u4f5c\u3002<\/p>\n<\/td>\n<\/tr>\n

BLOB<\/span><\/td>\n\n

L<\/span> <\/em> <\/span> +2<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <\/span> < 216<\/sup><\/span><\/p>\n<\/td>\n

\n

\u67094<\/span> \u79cdBLOB<\/span> \u7c7b\u578b\uff1aTINYBLOB<\/span> \u3001BLOB<\/span> \u3001MEDIUMBLOB<\/span> <\/span> <\/span> \u548cLONGBLOB<\/span> \u3002<\/p>\n

\u5b83\u4eec\u53ea\u662f\u53ef\u5bb9\u7eb3\u503c\u7684\u6700\u5927\u957f\u5ea6\u4e0d\u540c\u3002<\/p>\n<\/td>\n

\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61\uff0c\u53ef\u4ee5\u5bb9\u7eb3\u53ef\u53d8\u6570\u91cf\u7684\u6570\u636e\u3002<\/td>\n\u6ca1\u6709\u5b57\u7b26\u96c6\uff0c\u5e76\u4e14\u6392\u5e8f\u548c\u6bd4\u8f83\u57fa\u4e8e\u5217\u503c\u5b57\u8282\u7684\u6570\u503c\u503c\u3002<\/td>\n<\/tr>\n
TEXT<\/span><\/td>\n\n

L<\/span> <\/em> <\/span> +2<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <\/span> < 216<\/sup><\/span><\/p>\n<\/td>\n

\n

\u67094<\/span> \u79cdTEXT<\/span> \u7c7b\u578b\uff1aTINYTEXT<\/span> \u3001TEXT<\/span> \u3001MEDIUMTEXT<\/span> <\/span> <\/span> \u548cLONGTEXT<\/span> \u3002<\/p>\n

\u8fd9\u4e9b\u5bf9\u5e944<\/span> \u79cdBLOB<\/span> \u7c7b\u578b\uff0c\u6709\u76f8\u540c\u7684\u6700\u5927\u957f\u5ea6\u548c\u5b58\u50a8\u9700\u6c42\u3002<\/p>\n<\/td>\n

\u975e\u4e8c\u8fdb\u5236\u5b57\u7b26\u4e32(<\/span> \u5b57\u7b26\u5b57\u7b26\u4e32)<\/span> \u3002<\/td>\n\u6709\u4e00\u4e2a\u5b57\u7b26\u96c6\uff0c\u5e76\u4e14\u6839\u636e\u5b57\u7b26\u96c6\u7684 \u6821\u5bf9\u89c4\u5219\u5bf9\u503c\u8fdb\u884c\u6392\u5e8f\u548c\u6bd4\u8f83\u3002<\/td>\n<\/tr>\n
\n

TINYBLOB<\/span> , <\/span> TINYTEXT<\/span><\/p>\n<\/td>\n

\n

L<\/span> <\/em> <\/span> +1<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <\/span> < 28<\/sup><\/span><\/p>\n<\/td>\n

 <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
\n

MEDIUMBLOB<\/span> , <\/span> MEDIUMTEXT<\/span><\/p>\n<\/td>\n

\n

L<\/span> <\/em> <\/span> +3<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <\/span> < 224<\/sup><\/span><\/p>\n<\/td>\n

 <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
\n

LONGBLOB<\/span> , <\/span> LONGTEXT<\/span><\/p>\n<\/td>\n

\n

L<\/span> <\/em> <\/span> +4<\/span> \u4e2a\u5b57\u8282\uff0c\u5176\u4e2dL<\/span> <\/em> <\/span> < 232<\/sup><\/span><\/p>\n<\/td>\n

 <\/td>\n <\/td>\n <\/td>\n<\/tr>\n
\n

ENUM('value1<\/em> ','value2<\/em> ',...)<\/span><\/p>\n<\/td>\n

\n

1<\/span> \u62162<\/span> \u4e2a\u5b57\u8282\uff0c\u53d6\u51b3\u4e8e\u679a\u4e3e\u503c\u7684\u4e2a\u6570(<\/span> \u6700\u591a65,535<\/span> \u4e2a\u503c)<\/span><\/p>\n<\/td>\n

 <\/td>\n\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u5176\u503c\u6765\u81ea\u8868\u521b\u5efa\u65f6\u5728\u5217\u89c4\u5b9a\u4e2d\u663e\u5f0f\u679a\u4e3e\u7684\u4e00\u5217\u503c\u3002<\/td>\n\n

\u679a\u4e3e\u6700\u591a\u53ef\u4ee5\u670965,535<\/span> \u4e2a\u5143\u7d20\u3002<\/p>\n<\/td>\n<\/tr>\n

\n

SET('value1<\/em> ','value2<\/em> ',...)<\/span><\/p>\n<\/td>\n

\n

1<\/span> \u30012<\/span> \u30013<\/span> \u30014<\/span> \u6216\u80058<\/span> \u4e2a\u5b57\u8282\uff0c\u53d6\u51b3\u4e8eset<\/span> \u6210\u5458\u7684\u6570\u76ee(<\/span> \u6700\u591a64<\/span> \u4e2a\u6210\u5458)<\/span><\/p>\n<\/td>\n

 <\/td>\n\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\uff0c\u53ef\u4ee5\u6709\u96f6\u6216\u591a\u4e2a\u503c\uff0c\u5176\u503c\u6765\u81ea\u8868\u521b\u5efa\u65f6\u89c4\u5b9a\u7684\u5141\u8bb8\u7684\u4e00\u5217\u503c\u3002<\/td>\n\u6700\u591a\u53ef\u4ee5\u670964<\/span> \u4e2a\u4e0d\u540c\u7684\u6210\u5458\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

\u5176\u5b83\u6570\u636e\u5e93\u4e0eMySQL\u7684\u7c7b\u578b\u5bf9\u5e94\u5173\u7cfb\uff1a<\/strong> <\/span>
\n<\/span> <\/em> <\/span><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

\u5176\u5b83\u6570\u636e\u5e93\u7c7b\u578b<\/span> <\/strong><\/p>\n<\/td>\n

\n

MySQL<\/span> \u7c7b\u578b<\/span> <\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

BOOL<\/span> ,<\/span><\/p>\n<\/td>\n

\n

TINYINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

BOOLEAN<\/span><\/p>\n<\/td>\n

\n

TINYINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

CHAR VARYING(M<\/em> )<\/span><\/p>\n<\/td>\n

\n

VARCHAR(M<\/em> )<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

DEC<\/span><\/p>\n<\/td>\n

\n

DECIMAL<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

FIXED<\/span><\/p>\n<\/td>\n

\n

DECIMAL<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

FLOAT4<\/span><\/p>\n<\/td>\n

\n

FLOAT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

FLOAT8<\/span><\/p>\n<\/td>\n

\n

DOUBLE<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

INT1<\/span><\/p>\n<\/td>\n

\n

TINYINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

INT2<\/span><\/p>\n<\/td>\n

\n

SMALLINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

INT3<\/span><\/p>\n<\/td>\n

\n

MEDIUMINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

INT4<\/span><\/p>\n<\/td>\n

\n

INT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

INT8<\/span><\/p>\n<\/td>\n

\n

BIGINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

LONG VARBINARY<\/span><\/p>\n<\/td>\n

\n

MEDIUMBLOB<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

LONG VARCHAR<\/span><\/p>\n<\/td>\n

\n

MEDIUMTEXT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

LONG<\/span><\/p>\n<\/td>\n

\n

MEDIUMTEXT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

MIDDLEINT<\/span><\/p>\n<\/td>\n

\n

MEDIUMINT<\/span><\/p>\n<\/td>\n<\/tr>\n

\n

NUMERIC<\/span><\/p>\n<\/td>\n

\n

DECIMAL<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

MySQL\u5217\u7c7b\u578b\u5206\u4e3a3\u5927\u7c7b\uff1a\u6570\u503c\u7c7b\u578b\u3001\u65e5\u671f\u548c\u65f6\u95f4\u7c7b\u578b\u3001\u5b57\u7b26\u4e32\u7c7b\u578b\u3002<\/p>\n

 <\/p>\n

\u4e00\u3001\u6570\u503c\u7c7b\u578b<\/strong><\/p>\n

\u5982\u65e0\u7279\u522b\u8bf4\u660e<\/span>\uff0c<\/span><\/span>M<\/span><\/em><\/span> \u8868\u793a\u6700\u5927\u663e\u793a\u5bbd\u5ea6\u3002\u6700\u5927\u6709\u6548\u663e\u793a\u5bbd\u5ea6\u662f255<\/span> \u3002\u663e\u793a\u5bbd\u5ea6\u4e0e\u5b58\u50a8\u5927\u5c0f\u6216\u7c7b\u578b\u5305\u542b\u7684\u503c\u7684\u8303\u56f4\u65e0\u5173\u3002<\/p>\n\n\n\n\n\n\n\n
\u5b9a\u4e49<\/strong><\/td>\n\u5b58\u50a8\u9700\u6c42<\/strong><\/td>\n\u6570\u636e\u8303\u56f4<\/strong><\/td>\n\u8bf4\u660e<\/strong><\/td>\n<\/tr>\n
\u65e0\u7b26\u53f7<\/strong><\/td>\n\u6709\u7b26\u53f7<\/strong><\/td>\n<\/tr>\n
BIT[(M<\/em> )]<\/span><\/td>\n\u7ea6(<\/span>M<\/span><\/em><\/span>+7)\/8B<\/span><\/td>\n <\/td>\n <\/td>\n\u4f4d\u5b57\u6bb5\u7c7b\u578b\u3002M<\/span><\/em><\/span> \u8868\u793a\u6bcf\u4e2a\u503c\u7684\u4f4d\u6570\uff0c\u8303\u56f4\u4e3a\u4ece1<\/span> \u523064\uff1b<\/span>M<\/span><\/em><\/span> \u9ed8\u8ba4\u503c\u4e3a1<\/span> \u3002<\/td>\n<\/tr>\n
TINYINT[(M<\/em> )] [UNSIGNED] [ZEROFILL]<\/span><\/td>\n1B<\/span><\/td>\n0<\/span> ~255<\/span><\/td>\n-128<\/span> ~127<\/span><\/td>\n\u5f88\u5c0f\u7684\u6574\u6570\u3002<\/td>\n<\/tr>\n
BOOL<\/span> \uff0cBOOLEAN<\/span><\/td>\n <\/td>\n <\/td>\n <\/td>\nTINYINT(1)<\/span> \u7684\u540c\u4e49\u8bcd\u3002zero<\/span> \u503c\u4e3afalse...<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[288],"tags":[2,3],"class_list":["post-100","post","type-post","status-publish","format-standard","hentry","category-db","tag-MySQL","tag-SQL"],"_links":{"self":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/100","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/comments?post=100"}],"version-history":[{"count":0,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/posts\/100\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/media?parent=100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/categories?post=100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xiaobo.li\/notes\/wp-json\/wp\/v2\/tags?post=100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}