问题描述
假设我有桌子#Foo:
Let say I have table #Foo:
Id Color -- ---- 1 Red 2 Green 3 Blue 4 NULL
和表#Bar:
Value ----- 1 2.5
我想使用简单的语句来创建表结果:
I would like to create table Result using simple statement to get:
Id Color Value -- ---- ----- 1 Red 1 2 Green 2.5 3 Blue NULL 4 NULL NULL
到目前为止我发明的是:
What I have invented so far is:
WITH cte1 AS ( SELECT [Id], [Color], ROW_NUMBER() OVER (ORDER BY [Id]) AS 'No' FROM #Foo ), cte2 AS ( SELECT [Value], ROW_NUMBER() OVER (ORDER BY [Value]) AS 'No' FROM #Bar ) SELECT [Id], [Color], [Value] FROM cte1 c1 FULL OUTER JOIN cte2 c2 ON c1.[No] = c2.[No]
您知道在 T-SQL 中执行 ZIP JOIN 更快或更标准的方法吗?
Do you know faster or more standard way to do ZIP JOIN in T-SQL?
推荐答案
你可以试试这个.
;WITH CTE AS ( SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 1)) AS Id, Value FROM #Bar ) SELECT F.Id, F.Color, CTE.Value FROM #Foo F LEFT JOIN CTE ON CTE.Id = F.Id