Subquery returns more than 1 row in mysql

Question

I am executing the following query and got the error \"Subquery returns more than 1 row\"

My Query is

SELECT pkTicketID,
       TicketReplyDateAdded,
           


        

Answer 1

You can fix this error by limiting the subquery to return only one row, like this:

SELECT pkTicketID,TicketReplyDateAdded,
       TIMESTAMPDIFF(DAY, TicketReplyDateAdded,now()) as NumberOfDays 
FROM   tickets as T 
       LEFT JOIN ticket_replies as TR
       ON T.fkTicketReplyID=TR.pkTicketReplyID 
WHERE  1 
AND    T.fkEmployeeID = '4' 
AND    (SELECT TIMESTAMPDIFF(DAY, TicketReplyDateAdded, now()) as NumberOfDays 
        FROM tickets as T LEFT JOIN ticket_replies as TR 
        ON T.fkTicketReplyID=TR.pkTicketReplyID
        LIMIT 1) = 7 
AND     T.TicketStatus = 'Replied' 
ORDER   BY pkTicketReplyID DESC

(Added 'LIMIT 1')