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(qǐng)表,要求是讀出申請(qǐng)表中哪些人申請(qǐng)哪些物料
于是我先是這樣寫(xiě)的:
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 `mapply` where state = $state
ORDER BY `atime` , `uid` DESC
LIMIT 0,10
)
結(jié)果報(bào)錯(cuò)了
當(dāng)時(shí)沒(méi)注意報(bào)的什么錯(cuò)誤,只是看到LIMIT什么的錯(cuò)誤,于是改了下代碼
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 `mapply` where state = $state
ORDER BY `atime` , `uid` DESC
)
<pre name="code" class="sql">LIMIT 0,10</pre>
這樣沒(méi)有報(bào)錯(cuò),莫離以為OK了,但是運(yùn)行后發(fā)現(xiàn),數(shù)據(jù)有問(wèn)題
和單純的讀出申請(qǐng)表的內(nèi)容不一樣,才發(fā)現(xiàn)LIMIT的位置放錯(cuò)了,于是又把LIMIT發(fā)在IN里,結(jié)果報(bào)錯(cuò)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(shí)表,把需要的內(nèi)容先查出來(lái),
修改后代碼如下:
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(yùn)行后,問(wèn)題解決~~~
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