Sql server 带函数的SQL查询

我有一个数据表，我正在使用计数语句获取提交日期的记录数量 范例

基本上，我使用以下代码来获得结果

SELECT YEAR([Date]) as YEAR, CAST([Date] as nvarchar(25)) AS [Date], COUNT(*) as "Audit Count"
        FROM    AuditResults
        where AuditType = 'Identification' AND Product = 'Billet' 
        group by Date

这将返回一个示例

YEAR  Date  Audit Count
2017    2017-06-27  1
2017    2017-06-29  3

现在，我希望能够检索所有日期，即使是空的 所以我希望回报是

YEAR  Date  Audit Count
2017  2017-06-27    1
2017  2017-06-28    0
2017  2017-06-29    3

我尝试使用以下功能：

ALTER FUNCTION [dbo].[fnGetDatesInRange]
(   
    @FromDate datetime,
    @ToDate datetime
)
RETURNS @DateList TABLE (Dt date) 
AS
BEGIN
    DECLARE @TotalDays int, @DaysCount int


      SET @TotalDays =  DATEDIFF(dd,@FromDate,@ToDate)
      SET @DaysCount = 0


        WHILE @TotalDays >= @DaysCount
        BEGIN
                INSERT INTO @DateList
                SELECT (@ToDate - @DaysCount) AS DAT


                SET @DaysCount = @DaysCount + 1
        END
        RETURN
END

如何将select语句用于此函数？还是有更好的办法？

---

干杯

您必须创建另一个作为Mysql的表日历-这个想法在所有RDBMS上都是一样的-

CREATE TABLE `calendar` (
    `dt` DATE NOT NULL,
    UNIQUE INDEX `calendar_dt_unique` (`dt`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB
;

并填写日期数据

试试这个

ALTER FUNCTION [dbo].[fnGetDatesInRange]
(   
    @FromDate datetime,
    @ToDate datetime
)
RETURNS @YourData TABLE ([Year] int, DateText nvarchar(25),[Audit Count] int) 
AS
begin
insert into @YourData
SELECT 
    YEAR(allDates.[Date]) as YEAR, 
    CAST(allDates.[Date] as nvarchar(25)) AS [Date], 
    COUNT(r.Product) as "Audit Count"
from
    (
    SELECT 
        [date]=convert(datetime, CONVERT(float,d.Seq))
    FROM 
        (
        select top 100000 row_number() over(partition by 1 order by A.name) as Seq 
        from syscolumns A, syscolumns B  
        )d 
    )allDates
left join
    AuditResults r on r.[Date]=allDates.[date] and  r.AuditType = 'Identification' AND r.Product = 'Billet' 
where
    allDates.[Date]>=@FromDate and allDates.[Date]<=@ToDate
group by    
    allDates.[Date]

return
end

---

在本例中，这将返回1900和2173之间的所有日期。根据需要限制，但这是一个不错的选择。有很多不同的方法可以清楚地实现这一点

这只是另一种方法。使用语法作为RDBMS。我希望能够为fromdate和ToDate传入参数更新了什么？将存储过程合并到函数中？我现在怎么称呼它呢？从[dbo].[fnGetDatesInRange]'2017-05-24'，'2017-05-30'中选择*

ALTER FUNCTION [dbo].[fnGetDatesInRange]
(   
    @FromDate datetime,
    @ToDate datetime
)
RETURNS @YourData TABLE ([Year] int, DateText nvarchar(25),[Audit Count] int) 
AS
begin
insert into @YourData
SELECT 
    YEAR(allDates.[Date]) as YEAR, 
    CAST(allDates.[Date] as nvarchar(25)) AS [Date], 
    COUNT(r.Product) as "Audit Count"
from
    (
    SELECT 
        [date]=convert(datetime, CONVERT(float,d.Seq))
    FROM 
        (
        select top 100000 row_number() over(partition by 1 order by A.name) as Seq 
        from syscolumns A, syscolumns B  
        )d 
    )allDates
left join
    AuditResults r on r.[Date]=allDates.[date] and  r.AuditType = 'Identification' AND r.Product = 'Billet' 
where
    allDates.[Date]>=@FromDate and allDates.[Date]<=@ToDate
group by    
    allDates.[Date]

return
end

SELECT 
    [date]=convert(datetime, CONVERT(float,d.Seq))
FROM 
    (
    select top 100000 row_number() over(partition by 1 order by A.name) as Seq 
    from syscolumns A, syscolumns B  
    )d