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.
If you alter a table that is a master table for one or more materialized views, then Oracle Database marks the materialized views INVALID. Invalid materialized views cannot be used by query rewrite and cannot be refreshed. For information on revalidating a materialized view, see ALTER MATERIALIZED VIEW .