Plz help me in case statement

Question

Hi All,
In a table OT_C_S_R_HEAD in this there is a column "CSR_STATUS" having datatype "Number" and i have to apply case on this that if "2 or null is no, 1 is yes".
But apply getting some error "ORA-00932: inconsistent datatypes: expected NUMBER got CHAR"
SELECT
CSR_AOE_NO
, CASE CSR_STATUS
WHEN '2' THEN ('NO')
WHEN '1' THEN ('YES')
WHEN NULL THEN ('NO')
END CSR_STATUS
FROM OT_C_S_R_HEAD
plz reply asap....

Answer 1

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PL/SQL
>
In a table OT_C_S_R_HEAD in this there is a column "CSR_STATUS" having datatype "Number" and i have to apply case on this that if "2 or null is no, 1 is yes".
But apply getting some error "ORA-00932: inconsistent datatypes: expected NUMBER got CHAR"
>
The reply that you marked CORRECT will not cause the exception you were receiving but it will also NOT give you the results you want.
create table a (col1 number)
insert into a values (null)
insert into a values (1)
insert into a values (2)
insert into a values (3)
SELECT col1, CASE col1
WHEN 2 THEN ('NO')
WHEN 1 THEN ('YES')
WHEN NULL THEN ('NO')
END test
FROM a
COL1,TEST
1,YES
2,NO
3,You said you wanted 'NO' if the column has a NULL value but that query gives you a NULL. The query will also give you NULL for values other than 1 or 2 because there is no ELSE clause. Except in unusual cases there should always be an ELSE clause as a 'catch all'.
If all you want is YES for a 1 and NO for anything else just use
SELECT col1, CASE col1
WHEN 1 THEN ('YES')
ELSE ('NO')
END test
FROM a
COL1,TEST
,NO
1,YES
2,NO
3,NO