Sql语句的知识积累

SELECT T1.ManagerName Manager,T2.* FROM platform.dbo.Bonus_Amazon_ManagerTarget T1 WITH(NOLOCK)
OUTER APPLY
(
SELECT
Income=SUM(Income),
AfnIncome= SUM(AfnIncome),
InstockQTY=SUM(InstockQTY),
InstockCost=SUM(InstockCost),
InboundQTY=SUM(InboundQTY),
InboundCost=SUM(InboundCost),
NotCount=SUM(NotCount),
NotCountCost=SUM(NotCountCost),
ActualInCount=SUM(ActualInCount),
ActualInCountCost=SUM(ActualInCountCost),
TotalCost=SUM(TotalCost),
Rate=SUM(Rate),
ThirtySalesQty=SUM(ThirtySalesQty),
DOI=SUM(DOI),
SyncTime=MAX(SyncTime)
FROM Formal_Amazon.dbo.Report_Stockup_AmazonShop
WHERE Manager LIKE '%'+T1.ManagerName+'%'
) T2
WHERE T1.DataYear=DATEPART(YEAR,GETDATE()) AND T1.DataMonth=DATEPART(MONTH,GETDATE())

outer apply，主要是为了追加字段。该写法不适合复杂的sql查询，但有时候也是一个查询的解决方案，作为写SQL语句，应该要了解的一个写法

sql server中的datediff与dateadd，效率相差很大。datediff会破坏索引。具体操作可以写两条sql语句，
然后通过“显示估计的执行计划”来看执行效率   （PS：显示估计的执行计划，是优化sql非常重要的一个手段。ssms一般都会有，反正我的v18.5是有的）

标签：语句,积累,dbo,Income,SUM,Sql,T1,sql
来源： https://www.cnblogs.com/OnlyUserName/p/15744268.html