子查詢中的 CTE

Question

我有一個場景來顯示來自 2 個表組合的數據。 第一個名為“DayTable”的表由每日計划和實際組成。 名為“MonthTable”的第二個表包含每月計划和實際。 我需要顯示最近 6 個月的數據和當月的每日數據。 所以我為預期的輸出編寫了如下所示的查詢

 Declare @startdate date = CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, 0, GETDATE()))) 
 Declare @endDate date = DATEADD(DAY, -DAY(DATEADD(MONTH, 1, GETDATE())), DATEADD(MONTH, 1, GETDATE()))

CREATE TABLE #TEMP
(
 PlanDate NVARCHAR(100),
 [PastTrend - Plan] INT,
 [PastTrend - Actual] INT,
 [Current - Plan] INT,
 [Current - Actual] INT,
)

;With cte
as
(
    Select @startdate sDate
    Union All
    Select DATEADD(day,1,sDate) From cte where DATEADD(day,1,sDate) <= @endDate
)
INSERT INTO #TEMP
SELECT 
REPLACE(CONVERT(CHAR(6), A.sDate, 106),' ',' - ') PlanDate 
,NULL AS [PastTrend - Plan]
,NULL AS [PastTrend - Actual]
,SUM(B.PlanQuantity) AS [Current - Plan]
,SUM(B.Actual) AS [Current - Actual]
FROM cte A 
LEFT OUTER JOIN DayTable B 
ON A.sDate = CONVERT(DATE,B.PlanDate) 
GROUP BY A.sDate 
--ORDER BY A.sDate


SELECT
*

FROM
(
SELECT 
CONVERT(CHAR(3), datename(month,PlanMonth)) + ' ' + RIGHT(CONVERT(VARCHAR(4), YEAR(PlanMonth)), 2)  AS PlanDate
,SUM(PlanQuantity) AS [PastTrend - Plan]
,SUM(Actual) AS [PastTrend - Actual]
,NULL AS [Current - Plan]
,NULL AS [Current - Actual]
FROM 
MonthTable 
WHERE CONVERT(DATE, PlanMonth) >= CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, -6, GETDATE())))
group by PlanMonth 


UNION ALL

SELECT 
PlanDate
,[PastTrend - Plan]
,[PastTrend - Actual]
,[Current - Plan]
,[Current - Actual]
FROM 
#TEMP

) T1


 DROP TABLE #TEMP

我的輸出就像

現在我想避免臨時表的概念，因為如果創建臨時表后出現任何故障，它不會刪除。 所以重寫查詢如下

 Declare @startdate date = CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, 0, GETDATE()))) 
 Declare @endDate date = DATEADD(DAY, -DAY(DATEADD(MONTH, 1, GETDATE())), DATEADD(MONTH, 1, GETDATE()))

;With cte
as
(
    Select @startdate sDate
    Union All
    Select DATEADD(day,1,sDate) From cte where DATEADD(day,1,sDate) <= @endDate
)
SELECT 
A.sDate AS OriginalDate
,REPLACE(CONVERT(CHAR(6), A.sDate, 106),' ',' - ') PlanDate 
,NULL AS [PastTrend - Plan]
,NULL AS [PastTrend - Actual]
,SUM(B.PlanQuantity) AS [Current - Plan]
,SUM(B.Actual) AS [Current - Actual]
FROM cte A 
LEFT OUTER JOIN DayTable B 
ON A.sDate = CONVERT(DATE,B.PlanDate) 
GROUP BY A.sDate 

UNION ALL

SELECT 
PlanMonth AS OriginalDate
,CONVERT(CHAR(3), datename(month,PlanMonth)) + ' ' + RIGHT(CONVERT(VARCHAR(4), YEAR(PlanMonth)), 2)  AS PlanDate
,SUM(PlanQuantity) AS [PastTrend - Plan]
,SUM(Actual) AS [PastTrend - Actual]
,NULL AS [Current - Plan]
,NULL AS [Current - Actual]
FROM 
MonthTable 
WHERE CONVERT(DATE, PlanMonth) >= CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, -6, GETDATE())))
group by PlanMonth 

ORDER BY OriginalDate

但在這里我有問題。 在輸出中我不需要 OriginalDate。 如何避免這種情況。 為此，我可以將聯合輸出包裝到一個選擇查詢中，但是我怎么會在 cte 中出錯。 請指導我。 還建議哪種方法最好

Answer 1

我完成了查詢。 實際上，我只是將查詢包裝為外部而沒有 cte。 Cte 必須是查詢中的頂部。 最后的查詢是

    Declare @startdate date = CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, 0, GETDATE()))) 
     Declare @endDate date = DATEADD(DAY, -DAY(DATEADD(MONTH, 1, GETDATE())), DATEADD(MONTH, 1, GETDATE()))



;With cte
    as
    (
        Select @startdate sDate
        Union All
        Select DATEADD(day,1,sDate) From cte where DATEADD(day,1,sDate) <= @endDate
    )
    SELECT
    T1.PlanDate
    ,T1.[PastTrend - Plan]
    ,T1.[PastTrend - Actual]
    ,T1.[Current - Plan]
    ,T1.[Current - Actual]
    FROM
    (
    SELECT 
    A.sDate AS OriginalDate
    ,REPLACE(CONVERT(CHAR(6), A.sDate, 106),' ',' - ') PlanDate 
    ,NULL AS [PastTrend - Plan]
    ,NULL AS [PastTrend - Actual]
    ,SUM(B.PlanQuantity) AS [Current - Plan]
    ,SUM(B.Actual) AS [Current - Actual]
    FROM cte A 
    LEFT OUTER JOIN DayTable B 
    ON A.sDate = CONVERT(DATE,B.PlanDate) 
    GROUP BY A.sDate 

    UNION ALL

    SELECT 
    PlanMonth AS OriginalDate
    ,CONVERT(CHAR(3), datename(month,PlanMonth)) + ' ' + RIGHT(CONVERT(VARCHAR(4), YEAR(PlanMonth)), 2)  AS PlanDate
    ,SUM(PlanQuantity) AS [PastTrend - Plan]
    ,SUM(Actual) AS [PastTrend - Actual]
    ,NULL AS [Current - Plan]
    ,NULL AS [Current - Actual]
    FROM 
    MonthTable 
    WHERE CONVERT(DATE, PlanMonth) >= CONVERT(DATE, DATEADD(dd, -DAY(DATEADD(MONTH, 0, GETDATE())) + 1, DATEADD(MONTH, -6, GETDATE())))
    group by PlanMonth 
    ) T1 
    ORDER BY T1.OriginalDate

但我需要知道性能。 當我使用實際執行計划查詢成本（相對於批處理）執行此查詢時：100% 當我使用 temp 執行第一種方法時，查詢成本為 90%。 任何人都可以為此提供指導