ORA-12013
        updatable materialized view must be simple enough and have a materialized view log on its master table to do fast refresh
        
        
        Cause
        The updatable materialized view query contained a JOIN, SUBQUERY, UNION, CONNECT BY, ORDER BY, or GROUP BY clause, or the master table did not have a materialized view log.
        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. Make sure a materialized view log is created for the master table.
        
     
    
    
        ORA-12013
        updatable materialized view must be simple enough and have a materialized view log on its master table to do fast refresh
        
        
        Cause
        The updatable materialized view query contained a JOIN, SUBQUERY, UNION, CONNECT BY, ORDER BY, or GROUP BY clause, or the master table did not have a materialized view log.
        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. Make sure a materialized view log is created for the master table.
        
     
    
    
        ORA-12013
        updatable materialized view must be simple enough and have a materialized view log on its master table to do fast refresh
        
        
        Cause
        The updatable materialized view query contained a JOIN, SUBQUERY, UNION, CONNECT BY, ORDER BY, or GROUP BY clause, or the master table did not have a materialized view log.
        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. Make sure a materialized view log is created for the master table.