Eliminate the duplication and mimic a UNION operator by appending the DISTINCT operator

  

SQL> CREATE OR REPLACE TYPE list IS TABLE OF NUMBER;
  2  /

Type created.

SQL>
SQL> CREATE OR REPLACE FUNCTION format_list(set_in LIST) RETURN 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(1,2,3,4);
  3    b LIST := list(4,5,6,7);
  4  BEGIN
  5    dbms_output.put_line(format_list(a MULTISET UNION DISTINCT b));
  6  END;
  7  /
7

PL/SQL procedure successfully completed.

SQL>
SQL>

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Eliminate the duplication and mimic a UNION operator by appending the DISTINCT operator : UNION « Result Set « Oracle PL / SQL

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