Type list
| 类型 | 字节 | 最小值 | 最大值 |
| SMALLINT | 2 | -32 768 (unsigned: 0) | 32 767 (unsigned: 65 535) |
| INTEGER | 4 | -2 147 483 648 (unsigned: 0) | 2 147 483 647 (unsigned: 4 294 967 295) |
| BIGINT | 8 | -9 223 372 036 854 775 808 (unsigned: 0) | 9 223 372 036 854 775 807 (unsigned: 18 446 744 073 709 551 615) |
| DECIMAL(9) | 4 | -999,999,999 | 999,999,999 |
| DECIMAL(n) | 4 or 8 | n = 1 | n = 18 |
| NUMERIC(n) | 2, 4, 8 | n = 1 | n = 18 |