Operand should contain 1 column error [duplicate]

StackOverflow https://stackoverflow.com/questions/15159283

  •  16-03-2022
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Question

I have following query

SELECT * 
FROM users
WHERE id NOT IN (
    SELECT user_id
    FROM  `counter` 
    WHERE DATE_SUB( CURDATE( ) , INTERVAL 14 DAY ) <= created
)
AND id IN (
    SELECT user_id
    FROM coupon_used
)
AND id IN (
    SELECT user_id
    FROM accounts
)

I need to put where clause in coupon_used table that If user id IN coupon useed table where code ='xyz'. I did like this 

id IN (
    SELECT user_id, code 
    FROM coupon_used WHERE code ='xyz'
)

but show me an error that:

Operand should contain 1 Column.

Was it helpful?

Solution

A join would be better, but for the minimum changes to what you've written you can use the fact that the subquery doesn't need the column in its where clause to be in the select. i.e. instead of

id IN (
    SELECT user_id, code 
    FROM coupon_used WHERE code ='xyz'
)

you can use 

id IN (
    SELECT user_id
    FROM coupon_used WHERE code ='xyz'
)

OTHER TIPS

The reason why you are getting that error is because when using IN, the number of columns that should be returned on subquery must be exactly equal to one. But I rather use JOIN over IN clause.

The equivalent query of this using join:

SELECT  DISTINCT a.userID
FROM    counter a
        INNER JOIN coupon_used b
            ON a.ID = b.user_id
        INNER JOIN accounts c
            ON a.ID = c.user_id
WHERE   b.code ='xyz' AND
        DATE_SUB(CURDATE(), INTERVAL 14 DAY ) <= created
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