having to do with machinery: a mechanical failure. 2. being a machine; operated by machinery: a mechanical toy. 3. caused by or derived from machinery: mechanical propulsion.
ERROR: cannot alter type of a column used by a view or rule DETAIL: rule _RETURN on view v_change_me depends on column too_short. Though PostgreSQL tells us which view and column prompted this error, thatâs the last favor it provides.
Use the ALTER TABLE command to: 1  Change or drop a column default. 2  Rename a column or a table without changing the data type or size within the column or table. 3  Add or drop a table constraint or column constraint.  Modify the length of a varchar column.