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我正在使用以下查詢在我的一個Java swing應用程序中顯示記錄。此查詢執行速度非常慢。有沒有什麼辦法可以提高性能如何在tsql中提高子查詢的性能或子查詢的替代性
有沒有什麼辦法在較小的時間間隔內完成任務。
select d.orderid,d.ordername,d.design,isnull(e.OrderQty,0) OrderQty
from
(
select a.orderid,ordername,design
from filerorn a,ordersNew.dbo.orders b where a.orderid=b.orderid and sub_stage = 'G'
And a.id [email protected]
)d
LEFT JOIN
(
select a.OrderId,a.Design,(case when b.ItemId is null
then a.Qty else 1 end) -isnull(c.Qty,0) OrderQty from
OrdersNew..ordersDesign a
left join
OrdersNew..OrdersBGTPDesign b
on a.OrderId=b.OrderId and a.Design
COLLATE DATABASE_DEFAULT
=b.Design COLLATE DATABASE_DEFAULT and a.Sno=b.SNo
left join
(select a.OrderId,Design,Qty from ExcludeDesign a
left join
dbo.ExcludeDesign_d b
on a.ID=b.ID
)c
on a.OrderId=c.OrderId and a.Design
COLLATE DATABASE_DEFAULT
=c.Design COLLATE DATABASE_DEFAULT and a.Sno=c.Sno
)e
ON d.OrderId=e.OrderId and d.Design COLLATE DATABASE_DEFAULT
=e.Design COLLATE DATABASE_DEFAULT
and d.sno=e.Sno
and d.ItemId=e.ItemId
order by d.ordername,d.design,d.sno,d.Itemid
select d.orderid,d.ordername,d.design,isnull(e.OrderQty,0) OrderQty
from
(
select a.orderid,ordername,design
from filerorn a,ordersNew.dbo.orders b where a.orderid=b.orderid and sub_stage = 'G'
And a.id [email protected]
)d
LEFT JOIN
(
select a.OrderId,a.Design,(case when b.ItemId is null
then a.Qty else 1 end) -isnull(c.Qty,0) OrderQty from
OrdersNew..ordersDesign a
left join
OrdersNew..OrdersBGTPDesign b
on a.OrderId=b.OrderId and a.Design
COLLATE DATABASE_DEFAULT
=b.Design COLLATE DATABASE_DEFAULT and a.Sno=b.SNo
left join
(select a.OrderId,Design,Qty from ExcludeDesign a
left join
dbo.ExcludeDesign_d b
on a.ID=b.ID
)c
on a.OrderId=c.OrderId and a.Design
COLLATE DATABASE_DEFAULT
=c.Design COLLATE DATABASE_DEFAULT and a.Sno=c.Sno
)e
ON d.OrderId=e.OrderId and d.Design COLLATE DATABASE_DEFAULT
=e.Design COLLATE DATABASE_DEFAULT
and d.sno=e.Sno
and d.ItemId=e.ItemId
order by d.ordername,d.design,d.sno,d.Itemid
其中orderdesign和訂單都有記錄萬元
Edit
15％
select a.orderid,ordername,design
from filerorn a,ordersNew.dbo.orders b where a.orderid=b.orderid and sub_stage = 'G'
And a.id [email protected]
46％
select a.OrderId,a.Design,(case when b.ItemId is null
then a.Qty else 1 end) -isnull(c.Qty,0) OrderQty from
OrdersNew..ordersDesign a
left join
OrdersNew..OrdersBGTPDesign b
on a.OrderId=b.OrderId and a.Design
您是否使用了查詢分析器來確定查詢的最慢部分在哪裏？ –
爲什麼在這裏指定排序順序？ 'a.Design COLLATE DATABASE_DEFAULT = b.Design COLLATE DATABASE_DEFAULT'請你包含表格的模式和數據庫的缺省排序順序？知道這些字段是否具有不同的歸類序列和/或數據庫缺省值是否與這些字段不同是很重要的。如果您在查詢中強制排序順序發生變化，則會非常昂貴。 – MatBailie
是的，我這樣做是由於兩個表的排序規則的差異，因爲它產生的錯誤 –