SET operator removes any duplicates from the set and returns a new set with unique values : SET « Collections « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » Collections » SET 
26. 12. 11. SET operator removes any duplicates from the set and returns a new set with unique values
SQL> CREATE OR REPLACE TYPE list IS TABLE OF NUMBER;
  2  /

Type created.

SQL>
SQL> CREATE OR REPLACE FUNCTION format_list(set_in LISTRETURN VARCHAR2 IS
  2    returnValue VARCHAR2(2000);
  3  BEGIN
  4      FOR i IN set_in.FIRST..set_in.LAST LOOP
  5            returnValue := set_in(i)||' ';
  6      END LOOP;
  7      RETURN returnValue;
  8  END format_list;
  9  /

Function created.

SQL>
SQL> DECLARE
  2    a LIST := list(1,2,3,3,4,4,5,6,6,7);
  3  BEGIN
  4    dbms_output.put_line(format_list(SET(a)));
  5  END;
  6  /
7

PL/SQL procedure successfully completed.
26. 12. SET
26. 12. 1. SET Operator
26. 12. 2. IS A SET operator checks whether a variable is a VARRAY or NESTED TABLE collection variable
26. 12. 3. IS A SET, table collection
26. 12. 4. MULTISET EXCEPT operator finds the elements remaining from the first set after removing any matching elements from the second set
26. 12. 5. MULTISET EXCEPT table collection
26. 12. 6. MULTISET INTERSECT operator finds the intersection or matching values between two sets
26. 12. 7. MULTISET INTERSECT table collection
26. 12. 8. MULTISET UNION DISTINCT table collection
26. 12. 9. MULTISET UNION operator performs a UNION ALL operation on two collections
26. 12. 10. MULTISET UNION table collection
26. 12. 11. SET operator removes any duplicates from the set and returns a new set with unique values
26. 12. 12. SET(table collection)
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