两个临时表上的完全联接不返回所有结果 SQL Server

Question

更新：我已经包含了可以粘贴到 SSRS 中的完整代码，以显示结果。

我们报告大量以日期为中心的信息，并且必须从中生成报告。一些源数据没有及时更新，但为了确保报告整洁并且可以共享相同的日期列，我们有时会在查询上方使用 CTE 来生成过去 13 个月的列表。一台服务器仍在使用 SQL Server 2000，因此无法使用 CTE。我尝试填充两个临时表并使用完全连接，但它似乎将其视为内部连接。以下是代表性查询：

set DATEFORMAT ymd

IF object_id('tempdb..#EXAMPLE_SOURCE_DATA') is not null 
BEGIN    
  DROP TABLE #EXAMPLE_SOURCE_DATA
END

IF object_id('tempdb..#TEMP_STAGING') is not null 
BEGIN    
  DROP TABLE #TEMP_STAGING
END

IF object_id('tempdb..#TEMP_LAST13MONTHS') is not null 
BEGIN    
  DROP TABLE #TEMP_LAST13MONTHS
END

--This would normally be real data, but use a temporary for testing/bug fixing
CREATE TABLE #EXAMPLE_SOURCE_DATA(
   Date datetime,
   Actual float,
)

CREATE TABLE #TEMP_STAGING(
   Date datetime,
   Actual float,
)

CREATE TABLE #TEMP_LAST13MONTHS(
   Date13 datetime,
)

INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-06-27 12:34:56', 56.56)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-05-23 12:34:56', 45.45)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-04-11 12:34:56', 23.23)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-03-03 12:34:56', 12.12)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-02-01 12:34:56', 12.12)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-01-23 12:34:56', 45.45)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-04-11 12:34:56', 23.23)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-03-03 12:34:56', 12.12)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-02-01 12:34:56', 67.67)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-01-05 12:34:56', 56.56)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2011-02-01 12:34:56', 67.67)
INSERT INTO #EXAMPLE_SOURCE_DATA VALUES ('2010-12-05 12:34:56', 78.78)

-- Copy data to a temp table but 'flatten' the Date into beginning of month, to allow comparison and join.
INSERT INTO #TEMP_STAGING (Date, Actual)
SELECT 
  CAST(CAST(DATEPART(Year,Date) AS varchar) + '-' + CAST(DATEPART(Month,Date) AS varchar) + CAST('-01 00:00:00' as varchar) AS datetime) AS Date,
  Actual
FROM #EXAMPLE_SOURCE_DATA

--Insert rolling 13 months into a date table
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-1,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-2,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-3,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-4,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-5,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-6,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-7,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-8,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-9,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-10,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-11,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-12,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))
INSERT INTO #TEMP_LAST13MONTHS VALUES (DATEADD(MONTH,-13,DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE()),0)))

-- DEBUG
--/*
SELECT * FROM #TEMP_LAST13MONTHS ORDER BY Date13 DESC
SELECT * FROM #EXAMPLE_SOURCE_DATA ORDER BY Date DESC
SELECT * FROM #TEMP_STAGING ORDER BY Date DESC
--*/

--This doesn't return values against 2011-07-01 or before 2010-12-01 ??? (Date this 

was written 2011-08)
SELECT
  Date,
  SUM(Actual)
FROM #TEMP_LAST13MONTHS
FULL OUTER JOIN #TEMP_STAGING ON #TEMP_LAST13MONTHS.Date13 = #TEMP_STAGING.Date
GROUP BY Date
ORDER BY Date DESC

Answer 1

试试这个（我已经稍微更新了 sql）：

SELECT  Date,
        LEFT(CAST(DATENAME(Month, Date) AS NVARCHAR), 3) + ' ' + CAST(YEAR(Date) AS NVARCHAR) AS MonthYear
FROM    [#TEMP_LAST13MONTHS]
        LEFT OUTER JOIN [#TEMP_STAGING]
            ON [#TEMP_LAST13MONTHS].Date13 = [#TEMP_STAGING].Date
WHERE   Date IS NULL OR (Date BETWEEN @StartOfMonthlyReporting AND @EndOfMonthlyReporting)
ORDER BY Date DESC

很抱歉，我不能比要求您尝试上述方法更有帮助，因为我在运行您的脚本时收到以下错误：

消息 208，级别 16，状态 1，第 26 行无效的对象名称“dDate”。

Answer 2

您有一个 where 子句明确从#TEMP _STAGING 中选择date 列，从而有效地过滤掉#TEMP_LAST13MONTHS 中在#TEMP_STAGING 中没有对应行的每一行

将 where 子句更改为

(COALESCE(Date, Date13) BETWEEN @StartOfMonthlyReporting AND @EndOfMonthlyReporting)

应该足够了（并且使用FULL OUTER JOIN）

编辑

你可以使用这个

SELECT  [Date]
        , SUM([Actual])
FROM    (       
            SELECT  [Date] = COALESCE(#TEMP_STAGING.Date, #TEMP_LAST13MONTHS.Date13)
                    , [Actual] = COALESCE(Actual, 0)
            FROM    #TEMP_LAST13MONTHS 
                    FULL OUTER JOIN #TEMP_STAGING ON #TEMP_LAST13MONTHS.Date13 = #TEMP_STAGING.Date
        ) q
GROUP BY 
        Date
ORDER BY 
        Date DESC

或者这个

SELECT  [Date] = COALESCE(#TEMP_STAGING.Date, #TEMP_LAST13MONTHS.Date13)
        , [Actual] = SUM(COALESCE(Actual, 0))
FROM    #TEMP_LAST13MONTHS 
        FULL OUTER JOIN #TEMP_STAGING ON #TEMP_LAST13MONTHS.Date13 = #TEMP_STAGING.Date
GROUP BY
        COALESCE(#TEMP_STAGING.Date, #TEMP_LAST13MONTHS.Date13)
ORDER BY
        1 DESC

返回您需要的每一行。 （我的个人偏好是，虽然更长，第一个选项）