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這兩天項目裡出了一個成績，LIMIT應用後報錯。
需求是如許的，我有3張表，infor信息表，mconfig物料設置裝備擺設表，maaply物料請求表，請求是讀出請求表中哪些人請求哪些物料
因而我先是如許寫的：
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
)
成果報錯了
其時沒留意報的甚麼毛病，只是看到LIMIT甚麼的毛病，因而改了下代碼
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
)
<pre name="code" class="sql">LIMIT 0,10</pre>
如許沒有報錯，莫離認為OK了，然則運轉後發明，數據有成績
和純真的讀出請求表的內容紛歧樣，才發明LIMIT的地位放錯了，因而又把LIMIT發在IN裡，成果報錯以下
This version of MySQL doesn't yet support ‘LIMIT & IN/ALL/ANY/SOME subquery'
細看才曉得，IN裡不支撐LIMIT。那怎樣辦呢？
因而度娘後得知，在IN裡再應用一張暫時表，把須要的內容先查出來，
修正子女碼以下：
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`
)
運轉後，成績處理~~~
