请参阅 关于数据类型的文档.

您可以使用十进制/数字:

Precision     Storage bytes
1-9           5
10-19         9
20-28         13
29-38         17

但即使是最小的精度 (1-9) 也是 5 个字节.

but even the smallest precision (1-9) is 5 bytes.

查看整数族 (并忽略 bigint 因为它太过分了):

Looking at the integer family (and ignoring bigint because it's overkill):

Data type    Range                                                 Storage
int          -2^31 (-2,147,483,648) to 2^31-1 (2,147,483,647)      4 Bytes
smallint     -2^15 (-32,768) to 2^15-1 (32,767)                    2 Bytes
tinyint      0 to 255                                              1 Byte

...smallint 太小了，所以只用 integer.与每次 decimal/numeric 相比，它每次都会为您节省一个额外的字节.

... a smallint is too small, so just use integer. It'll save you an extra byte every time compared to decimal/numeric every time.