mysql整数
| 1 | tinyint | 1个字节 | (-128)----(128) | 0---255 |
| 2 | smallint | 2个字节 | -32768----32767 | 0---65535 |
| 3 | mediumint | 3个字节 | -8388608---8388607 | 0---1677215 |
| 4 | int | 4个字节 | -2147483648---2147483647 | 0---4294967295 |
| 5 | bigint | 8个字节 | -9223372036854775808 | 18446744073709551615 |
| 1 | float | 4个字节 | float(7,4) | float和double都会四舍五入 125.45209 =>125.4521 decimal定位精度数据 125.452090 |
| 2 | double | 8个字节 | double(7,4) | |
| 3 | decimal | M+2个字节 | decimal(10,6) |
| 1 | char | 0-255个字符 | char(32) | |
| 2 | varchar | 0-65535个字符 | varchar(255) | |
| 3 | text | 0-65535个字符 | text |
| 1 | date | 3个字节 | 1000-01-01到9999-12-31 | |
| 2 | time | 3个字节 | -835:59:59到835:59:59 | |
| 3 | datetime | 8个字节 | 1000-01-01 00:00:00到9999-12-31 23:59:59 | |
| 4 | timestamp | 4个字节 | 19700101080001-2038年某个时刻 |
转载于:https://blog.51cto.com/771541213/1792512