72

我有这个，我在设定的总数中得到一个错误。为什么我不能多次访问 cte？

ALTER PROCEDURE [dbo].[GetLeaguePlayers]
(
    @idleague int,
    @pageNumber int,
    @pageSize int,
    @total int OUTPUT
)
AS
WITH CTEPlayers AS
(
    SELECT ROW_NUMBER() OVER (ORDER BY p.Name) AS RowNumber, p.Id, p.Name, t.Name AS Team
    FROM Players p INNER JOIN Teams t ON p.IdTeam=t.Id INNER JOIN Leagues l ON l.Id=t.IdLeague
    WHERE l.Id=@idleague
)
SELECT Id, Name
FROM CTEPlayers c
WHERE RowNumber>@pageSize*(@pageNumber-1) AND RowNumber<@pageSize*@pageNumber;
SET @total = ( SELECT COUNT(*) FROM CTEPlayers )
4

6 回答 6

95

ACTE基本上是一次性的视图。它只持续一个语句，然后自动消失。

您的选择包括：

  • 第二次重新定义CTE。这就像从WITH...定义末尾复制粘贴到您的SET.

  • 将结果放入#temp表格或@table变量中

  • 将结果具体化为真实表格并参考

  • 稍微改变一下SELECT COUNT你的 CTE：

.

SELECT @total = COUNT(*)
FROM Players p 
INNER JOIN Teams t 
    ON p.IdTeam=t.Id 
INNER JOIN Leagues l 
    ON l.Id=t.IdLeague
WHERE l.Id=@idleague
于 2012-04-17T18:26:22.577 回答
24

以上答案均不正确...您可以执行一次CTE并达到您想要的结果..这是查询

ALTER PROCEDURE [dbo].[GetLeaguePlayers]
(
    @idleague int,
    @pageNumber int,
    @pageSize int,
    @total int OUTPUT
)
AS
WITH CTEPlayers AS
(
    SELECT p.Id, p.Name, t.Name AS Team
    FROM Players p INNER JOIN Teams t ON p.IdTeam=t.Id INNER JOIN Leagues l ON l.Id=t.IdLeague
    WHERE l.Id=@idleague
),
TotalCount AS
(
 SELECT COUNT(*) AS Total FROM CTEPlayers
),
Final_Result AS
(
 SELECT ROW_NUMBER() OVER (ORDER BY p.Name) AS RowNumber, p.Id, p.Name, t.Name AS Team,
  (SELECT Total FROM TotalCount) AS Total
    FROM CTEPlayers
)
SELECT Id, Name, @total = Total
FROM Final_Results c
WHERE RowNumber>@pageSize*(@pageNumber-1) AND RowNumber<@pageSize*@pageNumber;
于 2016-12-07T20:40:13.837 回答
19

根据定义，CTE 仅对一个语句有效。

您可以创建一个内联表值函数，然后随意使用它。内联函数的功能正如其名称所暗示的那样；它的查询成为使用它的查询的一部分（与单独执行并用作行集的非内联函数相反）。

于 2012-04-17T18:25:18.153 回答
4

多次使用 CTE 收集数据

;with CTEReminder AS
(
    Select r.ReminderID,r.IsVerificationRequired from ReminderTbl r      -- main table
),
FileTaskCountTempTbl   as     
    (
        select  COUNT(t.ReminderID) as FileTaskCount                     -- getting first result
            from TaskTbl t
                left join CTEReminder r on t.ReminderID = r.ReminderID          
    ),
FollowUpCountTempTbl  as
    (
        select COUNT(f.FollowUpID)  as Total                             -- getting second result
            from FollowUpTbl f              --cte not used here
    ),
MachineryRegularTaskCountTempTbl as
    (
        select  COUNT(t.ReminderID) as TotalCount                        -- getting third result
                from TaskTbl t
                    left join CTEReminder r on t.ReminderID = r.ReminderID                  
    ),
FinalResultTempTbl as
    (
        select COUNT(t.ReminderID)  as MachineryTaskCount,               -- getting fourth result
                (select * from MachineryRegularTaskCountTempTbl ) as MachineryRegularTaskCount,  -- Combining earlier results to last query 
                (select * from FollowUpCountTempTbl ) as FollowUpCount,   -- Combining earlier results to last query 
                (select * from FileTaskCountTempTbl ) as FileTaskCount   -- Combining earlier results to last query 
            from TaskTbl t
                left join CTEReminder r on t.ReminderID = r.ReminderID          
    )

select * from FinalResultTempTbl

在此处输入图像描述

于 2019-11-16T06:16:40.460 回答
0

在这种情况下，我使用这个： 

ALTER PROCEDURE [dbo].[GetLeaguePlayers]
(
 @idleague int,
 @pageNumber int,
 @pageSize int,
 @total int OUTPUT
)
AS

WITH CTEPlayers AS
(
    SELECT ROW_NUMBER() OVER (ORDER BY p.Name) AS RowNumber,    
        COUNT(1) OVER () AS RecordCount,
    p.Id, p.Name,   
    t.Name AS Team
    FROM Players p 
        INNER JOIN Teams t ON p.IdTeam=t.Id 
        INNER JOIN Leagues l ON l.Id=t.IdLeague
    WHERE l.Id=@idleague
)

SELECT RowNumber,
    CAST(CEILING(CAST(RecordCount AS FLOAT) / CAST(@pageSize AS FLOAT)) AS INT) PageCount,
    RecordCount,
    Id, 
    Name
FROM CTEPlayers c
WHERE RowNumber > @pageSize*(@pageNumber-1) AND RowNumber < @pageSize*@pageNumber;
于 2016-04-27T12:11:04.003 回答
0

将输出与总数一起存储在临时表中；设置输出变量值并从临时表中返回所需的列

ALTER PROCEDURE [dbo].[GetLeaguePlayers]
(
    @idleague int,
    @pageNumber int,
    @pageSize int,
    @total int OUTPUT
)
AS
WITH CTEPlayers AS
(
    SELECT ROW_NUMBER() OVER (ORDER BY p.Name) AS RowNumber, p.Id, p.Name, t.Name AS Team
    FROM Players p INNER JOIN Teams t ON p.IdTeam=t.Id INNER JOIN Leagues l ON l.Id=t.IdLeague
    WHERE l.Id=@idleague
),
TotalCounter(TotalRecords) as
(select count(1) from CTEPlayers)


SELECT Id, Name, TotalRecords(select TotalRecords from TotalCounter) into #tmp
FROM CTEPlayers c
WHERE RowNumber>@pageSize*(@pageNumber-1) AND RowNumber<@pageSize*@pageNumber;

SET @total = ( SELECT TotalRecords FROM #tmp)

select Id, Name from $tmp

drop table #tmp
于 2020-05-23T12:48:12.283 回答