Transparent tables have 1 - 1 cardinality b/w Data Dictionary and Database, and non transparent ( Cluster and Pooled) tables have Many - 1 cardinality. Transparent table can access with using OPen & NAtive SQL stmts where as Nontransparent only OPen Sql. Transparent trables can store Table relevent data and non transparent tables can store system data/ application data based on the transparent tables