Oracle Merge query

Question

Hi ,
I am writing a merge query for a Java application. I have a screen and I am going to take the values in the screen and check if those values exist in the database. If they exist, then I will have to update the data, else I will have to insert the data.
The query is like
MERGE INTO XYZ USING
(SELECT BONUS_ID,CUST_NBR FROM XYZ)B ON
(B.BONUS_ID = 2027 and B.CUST_NBR='181258225')
WHEN MATCHED THEN UPDATE SET
CUST_TYPE= 'S', REV_AMT= 123, POUND_TOTAL= 123, PKG_TOTAL= 123 WHERE
CUST_NBR = '181258225'
WHEN NOT MATCHED THEN INSERT
But this query is not working. I get the "Missing Keyword"

Answer 1

I meant nothing else
update xyz set ... where ...;
and
insert into xyz select ... from xyz where ...;
I wrote "When I check B.Bonus_ID it refers to the BonusID from XYZ table".
Let me give you one example with SCOTT schema.
I hope it illustrates well my concern of your
statement:
SQL> select ename, empno, sal from emp;
&nbsp
ENAME                     EMPNO        SAL
SMITH                      7369        800
ALLEN                      7499       1600
WARD                       7521       1250
JONES                      7566       2975
MARTIN                     7654       1250
BLAKE                      7698       2850
CLARK                      7782       2450
SCOTT                      7788       3000
KING                       7839       5000
TURNER                     7844       1500
ADAMS                      7876       1100
JAMES                      7900        950
FORD                       7902       3000
MILLER                     7934       1300
&nbsp
14 rows selected.
&nbsp
SQL> merge into emp using (select * from emp) b
  2  on (b.ename = 'KING')
  3  when matched then update set sal = 1000
  4  when not matched then insert (emp.empno, emp.ename, emp.deptno, emp.sal
  5  values(-b.empno, b.ename, b.deptno, 0)
  6  /
&nbsp
27 rows merged.
&nbsp
SQL> select ename, empno, sal from emp;
&nbsp
ENAME                     EMPNO        SAL
SMITH                     -7369          0
ALLEN                     -7499          0
WARD                      -7521          0
JONES                     -7566          0
MARTIN                    -7654          0
BLAKE                     -7698          0
CLARK                     -7782          0
SCOTT                     -7788          0
TURNER                    -7844          0
ADAMS                     -7876          0
JAMES                     -7900          0
FORD                      -7902          0
MILLER                    -7934          0
SMITH                      7369       1000
ALLEN                      7499       1000
WARD                       7521       1000
JONES                      7566       1000
MARTIN                     7654       1000
BLAKE                      7698       1000
CLARK                      7782       1000
SCOTT                      7788       1000
KING                       7839       1000
TURNER                     7844       1000
ADAMS                      7876       1000
JAMES                      7900       1000
FORD                       7902       1000
MILLER                     7934       1000
&nbsp
27 rows selected.Rgds.