如何计算使用 WITH 子句创建的临时 table 中的记录数

Question

我使用 sql 服务器创建了一个存储过程，我需要计算使用 'WITH' 子句创建的临时 table 中的记录数。我曾经使用那个 temp table 作为内部连接。除此之外，我想计算该记录 temp table 中的记录数并将该值设置为 @SlotCount 变量。

我这样试过（temp table name is cte）：

SELECT @SlotCount = COUNT(*) FROM cte

这会出错，因为我在存储过程中使用了两次 temp table。所以请帮我解决这个问题。谢谢

存储过程：

ALTER PROCEDURE [dbo].[usp_GetXXXXXXXXXXXXXXXXX]
    -- Add the parameters for the stored procedure here
    @Starttime DATETIME, 
    @Endtime DATETIME
AS
BEGIN
    
    DECLARE @SlotCount int
    
    ;WITH cte AS ( SELECT @Starttime starttime, DATEADD(MINUTE, 15, @Starttime) endtime
              UNION ALL
              SELECT endtime, DATEADD(MINUTE, 15, endtime)
              FROM cte
              WHERE endtime < @Endtime)

              --do something for count no of records in cte table and set that value to @SlotCount
            
            select count(a.AVAIL_ID),a.TEACHER_USERNAME 
            from cte c
            INNER JOIN AvailabilityDetail ad ON c.starttime = ad.StartDateTime AND c. endtime = ad.EndDateTime
            INNER JOIN AVAILABILITY a ON ad.AVAIL_ID = a.AVAIL_ID
            LEFT JOIN TEACHER_BIO b ON a.TEACHER_USERNAME = b.TEACHER_USERNAME
            WHERE ad.IsAvailable = 1
            AND ad.AvailabilityType = 'N'
            AND b.Active = 1
            AND b.IsGroupClass = 1
            AND b.HIDE_FROM_SCHEDULING = 0
            GROUP BY a.AVAIL_ID,a.TEACHER_USERNAME
            

END

Answer 1

您可以将结果存储到临时 table，然后 return 它

DECLARE @SlotCount int
;WITH cte AS ( SELECT @Starttime starttime, DATEADD(MINUTE, 15, @Starttime) endtime
              UNION ALL
              SELECT endtime, DATEADD(MINUTE, 15, endtime)
              FROM cte
              WHERE endtime < @Endtime)
                          
            select count(a.AVAIL_ID),a.TEACHER_USERNAME 
            INTO #cte from cte c
            INNER JOIN AvailabilityDetail ad ON c.starttime = ad.StartDateTime AND c. endtime = ad.EndDateTime
            INNER JOIN AVAILABILITY a ON ad.AVAIL_ID = a.AVAIL_ID
            LEFT JOIN TEACHER_BIO b ON a.TEACHER_USERNAME = b.TEACHER_USERNAME
            WHERE ad.IsAvailable = 1
            AND ad.AvailabilityType = 'N'
            AND b.Active = 1
            AND b.IsGroupClass = 1
            AND b.HIDE_FROM_SCHEDULING = 0
            GROUP BY a.AVAIL_ID,a.TEACHER_USERNAME

SELECT * FROM #cte

SET @SlotCount = (SELECT COUNT(*) FROM #cte)

如何计算使用 WITH 子句创建的临时 table 中的记录数

how to count no of records in a temporary table created using WITH clause

sql

sql-server

stored-procedures