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USER_CONS_OBJ_COLUMNS

List of types an object column or attribute is constrained to in the tables owned by the user 

Columns
   ___________________________
 
   TABLE_NAME
      Name of the table containing the object column or attribute
   COLUMN_NAME
      Fully qualified name of the object column or attribute
   CONS_TYPE_OWNER
      Owner of the type that the column is constrained to
   CONS_TYPE_NAME
      Name of the type that the column is constrained to
   CONS_TYPE_ONLY
      Indication of whether the column is constrained to ONLY type

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 SS64.com