Answer / guest

Cause: If a materialized view has a view whose definition
involves a UNION ALL query, then the materialized view's
defining query cannot have any clauses other than SELECT or
FROM. Other clauses such as WHERE, HAVING, CONNECT BY, or
GROUP BY are not allowed. Further more, the FROM clause
should have only one item.

Action: Remove any clauses besides SELECT and FROM from the
materialized view's defining query.

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