Oracle Error Codes

System triggers cannot have a REFERENCING clause

System triggers cannot have a FOR EACH ROW clause

System triggers should not reference a column in a WHEN clause

System triggers cannot be based on tables or views

Summary Advisor errorstring

Normal triggers cannot be based on a schema or a database

Cannot have more than one rollup/cube expression list

Client logon triggers cannot have BEFORE type

Ambiguous expression in GROUP BY ROLLUP or CUBE list

Client logoff triggers cannot have AFTER type