子查詢在sqlc中返回了超過1個值＃

Question

要在ADO.Net中運行的SQL命令字符串。它可能在子查詢中返回了多於一行的問題。

string str = " 
select 
(select (quantity) from Orderinfo where iron=1 and rno=o.rno) as iron 
,(select (quantity) from Orderinfo where wash=1 and rno=o.rno) as wash 
,(select (quantity) from Orderinfo where dryclean=1 and rno=o.rno) as dryclean 
,o.rno 
,o.id 
,o.name 
,(select sum(convert(int,d.quantity)) from orderinfo as d where d.rno=o.rno) as quantity 
,o.status 
from orderinfo as o 
where o.status='Order in Process' 
group by o.rno,o.id ,o.status ,o.name"; 

Answer 1

如果我正確理解你想要的結果，你需要得到量的總和：

string str = " 
select 
(select sum(quantity) from Orderinfo where iron=1 and rno=o.rno) as iron 
,(select sum(quantity) from Orderinfo where wash=1 and rno=o.rno) as wash 
,(select sum(quantity) from Orderinfo where dryclean=1 and rno=o.rno) as dryclean 
,o.rno 
,o.id 
,o.name 
,(select sum(convert(int,d.quantity)) from orderinfo as d where d.rno=o.rno) as quantity 
,o.status 
from orderinfo as o 
where o.status='Order in Process' 
group by o.rno,o.id ,o.status ,o.name"; 

順便說一句，我假設它是正確的，你想整個的量「o.rno 「獨立於具體的」o.id「。否則，子查詢不需要。