ORA-12013: updatable materialized views must be simple
enough to do fast refresh



ORA-12013: updatable materialized views must be simple enough to do fast refresh..

Answer / guest

Cause: The updatable materialized view query contained a
join, subquery, union, connect by, order by, or group by caluse.

Action: Make the materialized view simpler. If a join is
really needed, make multiple simple materialized views then
put a view on top of them.

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