sql分組函數

Question

我正在使用一個odbc連接到as400，我知道連接字符串是正確的，並且與所有其他查詢一起工作時沒有任何問題。

那爲什麼這條SQL語句的工作原理：

select 
    rdqty, 
    alib.rcvshpdt.mbsnodesc, 
    rdauthor, 
    rdtitle, 
    rdediton, 
    ifnull(iecactno,actvty) as actlvl, 
    class, 
    ifnull(ieclp,lp) as cst 
from 
    alib.rcvshpdt 
    left outer join 
    alib.bkmaster on alib.rcvshpdt.mbsnodesc=alib.bkmaster.mbsno 
    left outer join 
    alib.iecostda on alib.rcvshpdt.rcvno=alib.iecostda.rcvno 
    and alib.rcvshpdt.mbsnodesc = alib.iecostda.mbsnodesc 
where 
    alib.rcvshpdt.rcvno='3930697' 
order by 
    actlvl asc 

但只要我試着總結一個控管數量和分組結果如下失敗。

select 
    sum(rdqty) as quanity, 
    alib.rcvshpdt.mbsnodesc, 
    rdauthor, 
    rdtitle, 
    rdediton, 
    ifnull(iecactno,actvty) as actlvl, 
    class, 
    ifnull(ieclp,lp) as cst 
from 
    alib.rcvshpdt 
    left outer join 
    alib.bkmaster on alib.rcvshpdt.mbsnodesc=alib.bkmaster.mbsno 
    left outer join 
    alib.iecostda on alib.rcvshpdt.rcvno=alib.iecostda.rcvno 
    and alib.rcvshpdt.mbsnodesc = alib.iecostda.mbsnodesc 
where 
    alib.rcvshpdt.rcvno='3930697' 
group by 
    alib.rcvshpdt.mbsnodesc, rdauthor, rdtitle, rdediton, actlvl, class, cst 
order by 
    actlvl asc 

Answer 1

據我所知，你不能用別名進行分組。嘗試改變集團條款直接使用的計算如下所示：

alib.rcvshpdt.mbsnodesc，rdauthor，rdtitle，rdediton，IFNULL（iecactno，actvty）類，IFNULL（ieclp，LP）