Operand should contain 1 column(s) - in mysql query - mysql

Question

I have the following complex query that is giving me an error
Operand should contain 1 column(s)
Can anyone suggest what is wrong
SELECT
t.user_id AS user_id,
t.organisation_id AS organisation_id,
t.firstname AS firstname,
t.surname AS surname,
t.username AS username,
t.year_id AS year_id,
t.form_name AS form_name,
t.House AS House,
rcPoints.total AS milestoneRedeemedCodesTotal,
rcFilteredPoints.total AS redeemedCodesTotalFiltered,
(
COALESCE (rcFilteredPoints.total, 0) - COALESCE (milestoneHistory.total, 0)
) AS redeemedCodesTotalAvailableFiltered,
ABS(
FLOOR(
(
COALESCE (rcFilteredPoints.total, 0) - COALESCE (milestoneHistory.total, 0)
) / 1000
) * 1000
) AS redeemedCodesTotalTowardsMilestone,
ABS(
FLOOR(
(
COALESCE (rcFilteredPoints.total, 0) - COALESCE (milestoneHistory.total, 0)
) / 1000
)
) AS redeemedCodesMilestoneTriggers,
COALESCE (milestoneHistory.total, 0) AS historyTotal
FROM
`myuser` `t`
LEFT JOIN (
SELECT
rc.user_id AS user_id,
SUM(rc.school_points) AS total
FROM
`redeemed_codes` `rc`
INNER JOIN myuser m ON (m.user_id = rc.user_id)
WHERE
(rc.date_redeemed >= 0)
AND (m.organisation_id = 58022)
GROUP BY
rc.user_id
) AS rcPoints ON (rcPoints.user_id = t.user_id)
LEFT JOIN (
SELECT
rc.user_id AS user_id,
SUM(rc.school_points) AS total
FROM
`redeemed_codes` `rc`
INNER JOIN myuser m ON (m.user_id = rc.user_id)
WHERE
(rc.date_redeemed >= 0)
AND (m.organisation_id = 58022)
GROUP BY
rc.user_id
) AS rcFilteredPoints ON (
rcFilteredPoints.user_id = t.user_id
)
LEFT JOIN (
SELECT
mh.user_id AS user_id,
mh.milestone_id AS milestone_id,
MAX(mh.points_when_triggered) AS total
FROM
`milestone_history` `mh`
WHERE
mh.milestone_id = 13
GROUP BY
mh.user_id
) AS milestoneHistory ON (
milestoneHistory.user_id = t.user_id
)
WHERE
(
(
SELECT
COALESCE (count(*), 0)
FROM
milestone_history mha
WHERE
mha.milestone_id = 13
AND mha.user_id = t.user_id
) = 0
)
AND (t.organisation_id = 58022)
AND
(
SELECT * FROM
redeemed_codes t1
WHERE
organisation_id = 1
AND
(
SELECT
sum(school_points)
FROM
redeemed_codes t2
WHERE
t2.redeemed_code_id <= t1.redeemed_code_id
) >= 1000
ORDER BY redeemed_code_id
LIMIT 1
)
GROUP BY
t.user_id
ORDER BY
redeemedCodesMilestoneTriggers DESC
LIMIT 1

Answer 1

Your query might have multiple errors, but this condition in the WHERE clause is definitely suspect and would lead to that error:
AND (SELECT *
FROM redeemed_codes t1
WHERE organisation_id = 1 AND
(SELECT sum(school_points)
FROM redeemed_codes t2
WHERE t2.redeemed_code_id <= t1.redeemed_code_id
) >= 1000
ORDER BY redeemed_code_id
LIMIT 1
)
I have no idea what you are trying to do. Sometimes, the solution is simply EXISTS:
EXISTS (SELECT *
FROM redeemed_codes t1
WHERE organisation_id = 1 AND
(SELECT sum(school_points)
FROM redeemed_codes t2
WHERE t2.redeemed_code_id <= t1.redeemed_code_id
) >= 1000
)