MSSQL动态SQL查询为空

我在动态查询中遇到了一个问题，我想将

null

的值转换为零，我找到了

convert

的函数，但在我的动态查询中该函数不起作用

SET @DynamicPivotQuery = 
'select * from (
     select ct.category as [name], 
     CONVERT(nvarchar(50),   DATENAME(m, b.date) 
        + '', '' 
        + DATENAME(yyyy,b.date))as date 
        , sum(b.value) as value from bus bu
            join bus_category buc on bu.id = buc.business_unit_id
            join category ct on ct.id = buc.type_id
            join bus_actual b on buc.id = b.bus_category_id
        where b.date between '''+  cast     (@start as VARCHAR(50))+''' and '''+  cast     (@actual as VARCHAR(50))+'''
         and bu.name = '''+  cast     (@bus as VARCHAR(50))+'''
            group by buca.date, ct.category_name

我希望将

sum（b.value）

中

NULL

的值转换为零。怎么做

已更新

DECLARE @DynamicPivotQuery AS NVARCHAR(MAX)
DECLARE @ColumnName AS NVARCHAR(MAX)
DECLARE @start AS DateTime
DECLARE @end AS DateTime
DECLARE @actual AS DateTime
DECLARE @first AS DateTime
DECLARE @bus AS VARCHAR(50)

SET @start = '2015-07-01';
SET @end   = '2016-06-01';
SET @actual = '2015-09-01';
SET @first = '2015-10-01';
SET @bus = 'EUR';


--Get distinct values of the PIVOT Column 
SELECT @ColumnName= ISNULL(@ColumnName + ',','') 
       + QUOTENAME(date1)
FROM (  

    SELECT m.date1, m.date2 FROM(
SELECT DISTINCT CONVERT(nvarchar(50),   DATENAME(m, date) 
                               + ', ' 
                               + DATENAME(yyyy,date)) as date1, date as date2  

        FROM bus_actual where date between @start and  @actual 

        union all

                       SELECT DISTINCT
                        CONVERT(nvarchar(50),   DATENAME(m, date) 
                               + ', ' 
                               + DATENAME(yyyy,date)) as date1, date as date3 
                        FROM bus_forecast where date between @first and @end

        )m 
    )tab order by tab.date2

 SET @DynamicPivotQuery = 
'select * from (

        select ct.category as [name], 
        CONVERT(nvarchar(50),   DATENAME(m, bu.date) 
                               + '', '' 
                               + DATENAME(yyyy,bu.date))as date 

        ,ISNULL(sum(bu.value),0) as value from bus bu
            join bus_category buc on bu.id = buc.bus_id
            join category ct on ct.id = buc.id
            join bus_actual b on buc.id = b.bus_id
        where b.date between '''+  cast     (@start as VARCHAR(50))+''' and '''+  cast     (@actual as VARCHAR(50))+'''
         and bu.name = '''+  cast     (@bus as VARCHAR(50))+'''
            group by bu.date, ct.category

            ) as t

            PIVOT(  SUM(t.value) 
          FOR date IN (' + @ColumnName + ')) AS PVTTable'

            EXEC sp_executesql @DynamicPivotQuery, 
             N'@start datetime, @actual_date datetime, @bus VARCHAR(50)',
    @startFY = @start, @actual = @actual, @bus = @business_unit

---

我想你需要这样的东西：

IsNull( sum(b.value), 0 )

---

我想你需要这样的东西：

IsNull( sum(b.value), 0 )

更新-

DECLARE
      @DynamicPivotQuery NVARCHAR(MAX)
    , @ColumnName NVARCHAR(MAX)
    , @start DATETIME
    , @end DATETIME
    , @actual DATETIME
    , @first DATETIME
    , @bus VARCHAR(50)

SELECT
      @start = '2015-07-01'
    , @end = '2016-06-01'
    , @actual = '2015-09-01'
    , @first = '2015-10-01'
    , @bus = 'EUR'

SELECT @ColumnName = STUFF((
    SELECT ', ' + QUOTENAME(dt) dt
    FROM (
        SELECT [date], dt = DATENAME(m, [date])  + ' ' + DATENAME(yyyy, [date])
        FROM dbo.bus_actual
        WHERE [date] BETWEEN @start AND @actual 

        UNION

        SELECT [date], DATENAME(m, [date])  + ' ' + DATENAME(yyyy, [date]) 
        FROM dbo.bus_forecast
        WHERE [date] BETWEEN @first AND @end
    ) t
    ORDER BY [date]
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '')

SET @DynamicPivotQuery = 
'
SELECT *
FROM (
    SELECT
          ct.category
        , [date] = DATENAME(m, bu.[date]) + '' '' + DATENAME(yyyy, bu.[date])) 
        , bu.value
    FROM dbo.bus bu
    JOIN dbo.bus_category buc on bu.id = buc.bus_id
    JOIN dbo.category ct on ct.id = buc.id
    JOIN dbo.bus_actual b on buc.id = b.bus_id
    WHERE b.[date] between @startFY and @actual_date
        and bu.name = @bus
    GROUP BY bu.[date], ct.category
) t
PIVOT(
    SUM(value) 
    FOR [date] IN (' + @ColumnName + ')
) p'

EXEC sys.sp_executesql
    @DynamicPivotQuery, 
    N'@startFY DATETIME, @actual_date DATETIME, @bus VARCHAR(50)',
    @startFY = @start, @actual_date = @actual, @bus = @bus

更新-

DECLARE
      @DynamicPivotQuery NVARCHAR(MAX)
    , @ColumnName NVARCHAR(MAX)
    , @start DATETIME
    , @end DATETIME
    , @actual DATETIME
    , @first DATETIME
    , @bus VARCHAR(50)

SELECT
      @start = '2015-07-01'
    , @end = '2016-06-01'
    , @actual = '2015-09-01'
    , @first = '2015-10-01'
    , @bus = 'EUR'

SELECT @ColumnName = STUFF((
    SELECT ', ' + QUOTENAME(dt) dt
    FROM (
        SELECT [date], dt = DATENAME(m, [date])  + ' ' + DATENAME(yyyy, [date])
        FROM dbo.bus_actual
        WHERE [date] BETWEEN @start AND @actual 

        UNION

        SELECT [date], DATENAME(m, [date])  + ' ' + DATENAME(yyyy, [date]) 
        FROM dbo.bus_forecast
        WHERE [date] BETWEEN @first AND @end
    ) t
    ORDER BY [date]
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 2, '')

SET @DynamicPivotQuery = 
'
SELECT *
FROM (
    SELECT
          ct.category
        , [date] = DATENAME(m, bu.[date]) + '' '' + DATENAME(yyyy, bu.[date])) 
        , bu.value
    FROM dbo.bus bu
    JOIN dbo.bus_category buc on bu.id = buc.bus_id
    JOIN dbo.category ct on ct.id = buc.id
    JOIN dbo.bus_actual b on buc.id = b.bus_id
    WHERE b.[date] between @startFY and @actual_date
        and bu.name = @bus
    GROUP BY bu.[date], ct.category
) t
PIVOT(
    SUM(value) 
    FOR [date] IN (' + @ColumnName + ')
) p'

EXEC sys.sp_executesql
    @DynamicPivotQuery, 
    N'@startFY DATETIME, @actual_date DATETIME, @bus VARCHAR(50)',
    @startFY = @start, @actual_date = @actual, @bus = @bus

---

不要连接字符串，而是使用如下参数：

EXEC dbo.sp_executesql@DynamicPivotQuery，N'@start-DATE，@bus-VARCHAR（50），@start，@actual，@bus

sum（isnull（b.value，0））@lad2025不工作，我不知道问题出在哪里……您是否更改了

@DynamicPivotQuery

可能没有？不要使用字符串连接参数，例如：

EXEC dbo.sp\u executesql@DynamicPivotQuery，N'@start DATE，@actual DATE，@bus VARCHAR（50），@start，@actual，@bus

sum（isnull（b.value，0））@lad2025不起作用，我不知道出了什么问题……您是否更改了

@DynamicPivotQuery

可能没有更改？亲爱的Devart，谢谢您的回答，但有些问题不起作用，我完全按照您所说的做了，但输出仍然是

NULL

。再次感谢请提供

b.date

和

bu.name

的参数+数据类型值亲爱的Devart，我试过了，但有些东西不起作用，我很感谢你的工作，再次感谢你的帮助。我将投票赞成你的答案。非常感谢。亲爱的Devart，谢谢你的回答，但是有些东西不起作用，我完全按照你说的做了，但是输出仍然是

NULL

。再次感谢请提供

b.date

和

bu.name

的参数+数据类型值亲爱的Devart，我试过了，但有些东西不起作用，我很感谢你的工作，再次感谢你的帮助。我将投票赞成你的答案。非常感谢。