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.
The system tables should not be changed directly by any user. For example, do not try to modify system tables with DELETE, UPDATE, or INSERT statements, or user-defined triggers. Referencing documented columns in system tables is permissible.