Precision (database columns) Purpose Returns the column's (or parameter's) maximum number of digits used by the data type of the column or parameter. This attribute is read only at runtime. Data type Notes on the value returned character This is the length in characters of the data. binary data Column size is defined as the length in bytes of the data. time, timestamp, and all interval data types This is the number of characters in the character representation of this data. Syntax Table.Column (ColumnID).Precision