CODEWITHSUNDEEP
sqloracle-databasecase
Drajad
Drajad

Reputation: 53

Case on where clause ORACLE

SELECT *
FROM (
                SELECT P.PC_ID, PC.PC, P.BLOK_ID, B.BLOK, B.ID_MATERIAL, M.MATERIAL, M.NO_MATERIAL, P.START_DTTM, TO_CHAR(P.START_DTTM,'yyyy-mm-dd') DATE_PERENCANAAN
                FROM UTSG_PERENCANAAN P
                INNER JOIN UTSG_PC PC
                        ON P.PC_ID = PC.ID_PC
                INNER JOIN UTSG_BLOK B
                        ON P.BLOK_ID = B.ID_BLOK
                LEFT JOIN UTSG_MATERIAL M
                        ON B.ID_MATERIAL = M.ID_MATERIAL
                WHERE P.NO_LAMBUNG = '341'
                                AND P.LOKASI_ID = '2'
                                AND P.START_DTTM < TO_DATE('2019-01-09 23:40:52', 'yyyy-mm-dd hh24:mi:ss')
                ORDER BY P.START_DTTM DESC
)
WHERE 
    CASE
        WHEN BLOK = 'DD11'
            THEN ROWNUM <= 1
        ELSE
            THEN ROWNUM <= 2
    END

I have query like this, on case in where clause always show

error ORA-00905: missing keyword

Upvotes: 3

Views: 139

Answers (3)

Paul Maxwell
Paul Maxwell

Reputation: 35623

Why use a case expression?

WHERE (
        (BLOK = 'DD11' AND ROWNUM <= 1)
        OR 
        ROWNUM <= 2
    )

In general it is advised to use "boolean logic" in where clauses, here is an blog of the topic: SQL WHERE clauses: Avoid CASE, use Boolean logic

Upvotes: 4

Boneist
Boneist

Reputation: 23588

You can't have the comparison operator within the case statement. Instead, your where clause should be something like:

WHERE 
    rownum <= CASE WHEN BLOK = 'DD11' THEN 1
                   ELSE 2
              END

Upvotes: 5

Mahmoud Hassan
Mahmoud Hassan

Reputation: 331

I think you need to replace where clause to 

((BLOK = 'DD11' and ROWNUM <= 1) or (ROWNUM <= 2))

Upvotes: 2

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