如何在 T-SQL 中实现 ZIP JOIN?
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
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