1. Data type range
| Types of | byte | Minimum | Max |
| tinyint | 1 | Signed-128 Unsigned 0 |
Signed 127 Unsigned 255 |
| smallint | 2 | -32768 0 |
32767 65535 |
| mediumint | 3 | -8388608 0 |
8388607 1677215 |
| int,integer | 4 | -2147483648 0 |
2147483647 4294967295 |
| bigint | 8 | -9223372036854775808 (19th) 0 |
9223372036854775807 (19th) 18446744073709551615 Unsigned (20 bits) |
| float | 4 | ||
| double | 8 | ||
| DEC(M,D) | M+2 | ||
| Bit(M) | 1~8 |