【T-SQL】基礎——表別名

Som有時候咱們須要爲表設置別名，這樣就能夠方便的修改表。

若是在SSMS中，能夠點擊 Query-> SQL CMD mode

 

--Set Alisa for the table
:setvar tablename "[RetailDataWarehouse].[dbo].[FactUnit]"
Select ExternalOrderId,COUNT(DISTINCT(RetailTransactionId)) AS IDCount
into #X
--Use as a variable
From $(tablename)
group by ExternalOrderId