一位数的MySQL数据类型-tinyint（1）或smallint（1）或int（1）

Question

I need to add a column to mysql db table for storing single digits. The digits will be 0, 1, 2 , and 3 . What should be the datatype for the column?

tinyint(1) or smallint(1) or int(1) ?

Answer 1

Thats simple you can simply take tinyint for the simple reason that it takes only 1 byte(-128 to +127 / 0 to 255 (unsigned))

On a side note:

The reason why you can avoid the other is that smallint takes 2 bytes and int takes 4 bytes, and since you have only 4 values which you want to store so no need to waste the memory.

Answer 2

TINYINT UNSIGNED

Read about integer types https://dev.mysql.com/doc/refman/5.1/en/integer-types.html