将值传递给MySQL中的嵌套查询

Question

我有以下MySQL查询

SELECT lp.profileTitle, lp.lessonLength AS length, la.validFrom, la.validTo, ow.firstname, ow.surname, ow.outworker_id
FROM lessonProfile AS lp, lessonAvail AS la, outworker AS ow, outworkerAssign AS oa
WHERE lp.lessonProfileId = profileId
AND oa.lessonProfileId = lp.lessonProfileId
AND oa.outworkerId = ow.outworker_id
AND validFrom <= '2011-08-23'
AND (validTo >= '2011-08-23' OR validTo = '0000-00-00')
AND ow.outworker_id <> (SELECT ow.outworker_id
            FROM outworker AS ow, bookingDiary AS bd
            WHERE bd.outworkerId = ow.outworker_id
            AND (bd.startTime BETWEEN '2011-08-23 12:00:00' AND DATE_ADD('2011-08-23 12:00:00', INTERVAL 60 MINUTE)
            OR DATE_ADD(bd.endTime, INTERVAL (IFNULL(break,0)) MINUTE) BETWEEN '2011-08-23 12:00:00' AND DATE_ADD('2011-08-23 12:00:00', INTERVAL 60 MINUTE)
            OR bd.startTime <= '2011-08-23 12:00:00' AND DATE_ADD(bd.endTime, INTERVAL (IFNULL(break,0)) MINUTE) >= DATE_ADD('2011-08-23 12:00:00', INTERVAL 60 MINUTE)))

我需要将长度值从第一行传递到嵌套查询，而不是INTERVAL 60 MINUTE

因此嵌套查询将是INTERVAL长度MINUTE

但我被卡住了！

Answer 1

您可以在嵌套查询中将其引用为lp.lessonLength。