我试过这样的查询,但收到类似的消息
未使用EXISTS引入子查询时,只能在选择列表中指定一个表达式
码:
select
MaterialID = REPLACE(MaterialID, 'MA','Material'),
MaterialName = UPPER(MaterialName),
(select
PurchaseDate,
PurchaseQty
from
MsPurchase
where
PurchaseQty > AVG(PurchaseQty))
from
MsMaterial
where
MaterialType = 'supplies'
我想您需要在下面-
select
m1.MaterialID = REPLACE(MaterialID, 'MA','Material'),
m1.MaterialName = UPPER(MaterialName),
m2.PurchaseDate,
m2.PurchaseQty
from
MsMaterial m1
join (select
PurchaseDate,
PurchaseQty,
MaterialID
from
MsPurchase
where
PurchaseQty > AVG(PurchaseQty)
) m2 on m1.MaterialID = m2.MaterialID
where
MaterialType = 'supplies'
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