SELECT OWNER, TABLE_NAME, COLUMN_NAME, CONSTRAINT_NAME
  FROM DBA_CONS_COLUMNS c
  WHERE position=1 AND
   (OWNER, TABLE_NAME, COLUMN_NAME) IN
   (
		SELECT c.OWNER, c.TABLE_NAME,cc.COLUMN_NAME
		  FROM DBA_CONSTRAINTS  c, DBA_CONS_COLUMNS cc
		 WHERE c.CONSTRAINT_NAME = cc.CONSTRAINT_NAME
		   AND c.TABLE_NAME      = cc.TABLE_NAME
		   AND c.OWNER           = cc.OWNER
		   AND c.CONSTRAINT_TYPE = 'R'
		   AND cc.POSITION       = 1
		   AND c.OWNER           = UPPER('DBSVS')
		   AND c.TABLE_NAME      = UPPER('TB_DOCUMENTO')
		 MINUS
		SELECT table_owner, table_name, column_name
		  FROM DBA_IND_COLUMNS
		 WHERE COLUMN_POSITION = 1
		   AND TABLE_OWNER = UPPER('DBSVS')
		   AND TABLE_NAME  = UPPER('TB_DOCUMENTO')
	)
  ORDER BY OWNER, TABLE_NAME, CONSTRAINT_NAME;