多个 CTE 查询，将单列值分配给局部变量

Question

这是我的 sql 查询。如何将 Count_CTE.TotalRecords 结果分配给我的本地分配变量？有人请吗？？？

DECLARE  @Totalrecords Bigint =0;

;WITH Main_Query_CTE AS(

SELECT 
U.Id,
U.Username,
P.Id as ProfileId,
P.Firstname,
P.Lastname 
FROM   [Dbo].[User] U
INNER JOIN [Profile] P
ON U.Id = P.Userid 
WHERE  AND U.[Status] <>0

),
Count_CTE AS ( SELECT COUNT(*) as TotalRecords FROM Main_Query_CTE )

SELECT * FROM Main_Query_CTE ,Count_CTE
ORDER BY Main_Query_CTE.Id
OFFSET 0 ROWS
FETCH NEXT 20 ROWS ONLY

Answer 1

正如 Gordan 所说，您不能在同一选择语句中分配变量并返回选择。如果您需要分配一个局部变量，最好的选择是将数据放入临时表中，然后进行选择。不过，您的问题有点不清楚 - 不确定您选择的最终目标是什么。

DECLARE  @Totalrecords Bigint =0;

SELECT 
U.Id,
U.Username,
P.Id as ProfileId,
P.Firstname,
P.Lastname 
into #temp
FROM   [Dbo].[User] U
INNER JOIN [Profile] P
ON U.Id = P.Userid 
WHERE  AND U.[Status] <> 0  

select @Totalrecords = COALESCE(COUNT(*),0) FROM #temp;

SELECT *
FROM #temp
ORDER BY id
OFFSET 0 ROWS
FETCH NEXT 20 ROWS ONLY

Answer 2

抱歉，我参加这个聚会迟到了（希望我在 2019 年停下来），但为什么不在一个查询而不是两个单独的查询中返回结果呢？

WITH cte AS(
SELECT 
    U.Id,
    U.Username,
    P.Id as ProfileId,
    P.Firstname,
    P.Lastname,
    COUNT(*) OVER(PARTITION BY NULL) AS TotalRecords
FROM [Dbo].[User] U
INNER JOIN [Profile] P ON U.Id = P.Userid 
WHERE U.[Status] <> 0

)

SELECT * FROM cte
ORDER BY Id
OFFSET 0 ROWS
FETCH NEXT 20 ROWS ONLY