. Whole Numbers (Integer) = TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT
1.1 Choose wisely between Signed or Unsigned
TINYINT vs. TINYINT UNSIGNED (-128 to 127) vs. (0 to 255)
The range from 1 to 99999, MEDIUMINT UNSIGNED is the best type.
1.2 Whole number data type does not effect computational time
1.3 INT(1) or INT(20) is identical in terms of storage space & processing
They will use INT datatype, only for display purposes.