Can we use where clause in Update on Merge statement?

Question

Hi All,
I tried to execute the following Merge Query:
When this query is executed without ‘Where clause’ in Update statement its working fine. When executed with ‘Where clause’ it throwing the following error:
ORA-00905: missing keyword.
Following is the sample query which I tried to execute:
MERGE INTO TABLE_NAME
USING (SELECT COLUMN FORM TABLES)
ON (CONDITION)
WHEN MATCHED THEN
UPDATE SET
     COLUMN UPATES
WHERE CONDITION -- Can we use where clause here?
WHEN NOT MATCHED THEN
INSERT
INSERT VALUES;
Can some one help on this?
Thanks in advance.
Darius

Answer 1

Yes:
SQL> drop table emp1;
Table dropped.
SQL> create table emp1 as select * from emp where deptno = 30;
Table created.
SQL> update emp1 set sal = sal*2;
6 rows updated.
SQL> commit;
Commit complete.
SQL> select ename,sal from emp1;
ENAME             SAL
ALLEN            3200
WARD             2500
MARTIN           2500
BLAKE            5700
TURNER           3000
JAMES            1900
6 rows selected.
SQL> MERGE INTO emp1
  2  USING(select * from emp) emp
  3  ON (emp1.empno = emp.empno)
  4  WHEN MATCHED THEN
  5  UPDATE SET sal = emp.sal WHERE ename = 'TURNER'
  6  WHEN NOT MATCHED THEN
  7  INSERT(ename,sal) VALUES(emp.ename,emp.sal);
9 rows merged.
SQL> select ename,sal from emp1;
ENAME             SAL
ALLEN            3200
WARD             2500
MARTIN           2500
BLAKE            5700
TURNER 1500
JAMES            1900
SMITH             800
JONES            2975
CLARK            2450
SCOTT            3000
KING             5000
ENAME             SAL
ADAMS            1100
FORD             3000
MILLER           1300
14 rows selected.
SQL> SY.