... one DBMS. Catalog creation is implementation dependent and therefore not part of the SQL standard.Prior to SQL- 92, clusters often represented database les, and the clustering of objects into ... long. ey are not case sen-sitive. (In fact, many SQL command processors convert names to all upper- or lowercase characters before submitting a SQL statement to a DBMS for processing.)Note: ... neither is recognized by SQL queries so their use should be avoided.To a database designer, a schema represents the overall, logi-cal design of a complete database. As far as SQL is concerned, however,...