需求是這樣的，我有3張表，infor信息表，mconfig物料配置表，maaply物料申請表，要求是讀出申請表中哪些人申請哪些物料

于是我先是這樣寫的：

SELECT infor.name,infor.phone,infor.add,
mconfig.mname,mapply.acount,from_unixtime(mapply.atime,'%Y-%m-%d') as 'atime'
FROM mapply right JOIN infor ON mapply.uid = infor.uid inner JOIN mconfig ON mapply.mid = mconfig.mid
WHERE mapply.aid
IN (
SELECT aid
FROM `mapply` where state = $state
ORDER BY `atime` , `uid` DESC
LIMIT 0,10
)

結(jié)果報錯了

當(dāng)時沒注意報的什么錯誤，只是看到LIMIT什么的錯誤，于是改了下代碼

SELECT infor.name,infor.phone,infor.add,
mconfig.mname,mapply.acount,from_unixtime(mapply.atime,'%Y-%m-%d') as 'atime'
FROM mapply right JOIN infor ON mapply.uid = infor.uid inner JOIN mconfig ON mapply.mid = mconfig.mid
WHERE mapply.aid
IN (
SELECT aid
FROM `mapply` where state = $state
ORDER BY `atime` , `uid` DESC
)

LIMIT 0,10

和單純的讀出申請表的內(nèi)容不一樣，才發(fā)現(xiàn)LIMIT的位置放錯了，于是又把LIMIT發(fā)在IN里，結(jié)果報錯如下

This version of MySQL doesn't yet support ‘LIMIT & IN/ALL/ANY/SOME subquery'

細(xì)看才知道，IN里不支持LIMIT。那怎么辦呢？

于是度娘后得知，在IN里再使用一張臨時表，把需要的內(nèi)容先查出來，

修改后代碼如下：

SELECT infor.name,infor.phone,infor.add,
mconfig.mname,mapply.acount,from_unixtime(mapply.atime,'%Y-%m-%d') as 'atime'
FROM mapply right JOIN infor ON mapply.uid = infor.uid inner JOIN mconfig ON mapply.mid = mconfig.mid
WHERE mapply.aid
IN (
SELECT aid
FROM （SELECT `aid` FROM `mapply` where state = $state
ORDER BY `atime` , `uid` DESC
LIMIT 0,10）AS `tp`
)

運行后，問題解決~~~bitsCN.com

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