Precision

Precision refers to the total number of digits that the data type should include. This number can range from 1 to 31.Use the Precision field if you specified either a Decimal or a Numeric data type.

Scale refers to the number of digits to the right of the decimal point that the data type should include. This number can range from 0 to the precision.

If you specify precision, but not scale, the default for scale is 0. If you leave length blank, the default for precision is 5 and the default for scale is 0.