MySQL字段的取值范围:TINYINT -128 127 TINYINT UNSIGNED 0 255 SMALLINT -32768 32767 SMALLINT UNSIGNED 0 65535 MEDIUMINT -8388608 8388607 MEDIUMINT UNSIGNED 0 16777215 INT 或 INTEGER -21474838 21474837 INT UNSIGNED 或 INTEGER UNSIGNED 0 4294967295 BIGINT -92