Question

我有这个，我在设定总数时收到错误。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 )

Answer 1

CTE基本上是一次性视图。它只会持续一个语句，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...复制粘贴到定义结尾到SET之前一样简单。
将结果放入#temp表格或@table变量
将结果具体化为真实表并引用
从您的CTE稍微改为SELECT COUNT：

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

Answer 2

以上答案都不正确......您可以执行一次CTE并获得您想要的结果..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;

Answer 3

根据定义，CTE仅对一个陈述有效。

您可以创建inline table-valued function，然后根据需要随时使用。内联函数的作用与名称相同;它的查询将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形成对比）。

Answer 4

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;

Answer 5

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              
    ),
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

Answer 6

将输出连同总数一起存储在临时表中；设置输出变量值并从临时表返回所需的列

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

多次使用一个CTE

6 个答案: