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Debug this code: SELECT CLIENT_ID, CLIENT_NAME FROM CLIENTS WHERE NVL(REFERRAL,ZZZ)= (SELECT NVL(REFERRAL,ZZZ)                        &nbsp

Debug this code:

SELECT CLIENT_ID, CLIENT_NAME

FROM CLIENTS

WHERE NVL(REFERRAL,ZZZ)= (SELECT NVL(REFERRAL,ZZZ)

                         FROM CLIENTS

                         WHERE CLIENT_ID = 000365)

ORDER BY CLIENT_ID;

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Answer #1

This code finds the clients who have the Same referral code as of clientId 000365. If clientId 000365 do not has any referral code, then Clients with null referral value are selected.

NVL(REFERRAL, ZZZ) => This statement checks the value of REFERRAL column on row, and returns it if it is not null. If it is null, then instead it will return "ZZZ".

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