Sql 使用介于2个日期参数之间且包含2个日期参数的日期填充临时表的最简单方法

用包含两个日期参数的日期填充临时表的最简单方法是什么。我只需要每月的第一天

例如，如果@StartDate='2011-01-01'和@EndDate='2011-08-01'

那我要把这个放回桌上

2011-01-01
2011-02-01
2011-03-01
2011-04-01
2011-05-01
2011-06-01
2011-07-01
2011-08-01

即使@StartDate不是一个月的第一天，也可以通过返回到StartDate月的第一天来工作解决方案：

DECLARE  @StartDate DATETIME
        ,@EndDate DATETIME;

SELECT   @StartDate = '20110105'
        ,@EndDate = '20110815';

SELECT  DATEADD(MONTH, DATEDIFF(MONTH, 0, DATEADD(MONTH, v.number, @StartDate)), 0) AS FirstDay
--or Andriy M suggestion:
--SELECT    DATEADD(MONTH, DATEDIFF(MONTH, 0, @StartDate) + v.number, 0) AS FirstDay
INTO    #Results
FROM    master.dbo.spt_values v
WHERE   v.type = 'P'        
AND     DATEDIFF(MONTH, @StartDate, @EndDate) >= v.number;

SELECT  *
FROM    #Results;

DROP TABLE #Results;

结果:

FirstDay
-----------------------
2011-01-01 00:00:00.000
2011-02-01 00:00:00.000
2011-03-01 00:00:00.000
2011-04-01 00:00:00.000
2011-05-01 00:00:00.000
2011-06-01 00:00:00.000
2011-07-01 00:00:00.000
2011-08-01 00:00:00.000

---

即使@StartDate不是一个月的第一天，这也有效。我假设如果不是月初，你想从下个月的第一个月开始。否则，请拆下+1：

;WITH cte AS (
SELECT CASE WHEN DATEPART(Day,@StartDate) = 1 THEN @StartDate 
            ELSE DATEADD(Month,DATEDIFF(Month,0,@StartDate)+1,0) END AS myDate
UNION ALL
SELECT DATEADD(Month,1,myDate)
FROM cte
WHERE DATEADD(Month,1,myDate) <=  @EndDate
)
SELECT myDate
FROM cte
OPTION (MAXRECURSION 0)

---

这在SQL2008R2中进行了测试

Declare @StartDate datetime = '2015-03-01'
Declare @EndDate datetime = '2015-03-31'
declare @temp Table
(
DayDate datetime
);

WHILE @StartDate <= @EndDate
begin
 INSERT INTO @temp (DayDate) VALUES (@StartDate);
 SET @StartDate = Dateadd(Day,1, @StartDate);
end ;

select * from @temp

---

有趣的是，根据枚举数据创建数据的速度更快

---

在我的机器上，使用大的日期范围，速度大约快60%。不过，递归方法可以在大约3秒钟内填充2000年的数据，而且看起来更好，所以我不建议仅在递增天数时使用这种方法。

空日期更正：

IF OBJECT_ID('tempdb..#dim') IS NOT NULL 

    DROP TABLE #dim

CREATE  TABLE #dim ([date] DATE)

if not @Begin_Date is null and not @End_Date is null

begin
    INSERT #dim([date])
    SELECT d
    FROM(

      SELECT
          d = DATEADD(DAY, rn - 1, @Begin_Date)
      FROM 
      (
          SELECT TOP (DATEDIFF(DAY, @Begin_Date, @End_Date)) 
              rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
          FROM
              sys.all_objects AS s1
          CROSS JOIN
              sys.all_objects AS s2
          ORDER BY
              s1.[object_id]
      ) AS x
    ) AS y;
end

---

+1，您还可以执行DATEDIFFMONTH，0，@StartDate+v.number，而不是DATEDIFFMONTH，0，DATEADDMONTH，v.number，@StartDate。在单个记录中按原样运行示例的结果。我遗漏了什么？@ElanHasson，你是否在不同的月份设置了StartDate和EndDate？如果StartDate不是一个月的第一个月，则使用下个月的第一个月。这就是我遗漏的。我用了尼廷的解决方案，因为它最近被投票通过了。对于SQL 2012或更高版本，ELSE表达式应替换为：ELSE DATEADDDay，1，EOMONTH@StartDate以MyDate结尾，交叉连接技巧很酷。与其他解决方案相比，For可以立即执行数千行。

Declare @StartDate datetime = '2015-03-01'
Declare @EndDate datetime = '2015-03-31'
declare @temp Table
(
DayDate datetime
);

WHILE @StartDate <= @EndDate
begin
 INSERT INTO @temp (DayDate) VALUES (@StartDate);
 SET @StartDate = Dateadd(Day,1, @StartDate);
end ;

select * from @temp

DayDate
-----------------------
2015-03-01 00:00:00.000
2015-03-02 00:00:00.000
2015-03-03 00:00:00.000
2015-03-04 00:00:00.000
...

DECLARE @StartDate DATE = '10001201';
DECLARE @EndDate DATE   = '20000101';

DECLARE @dim TABLE ([date] DATE)

INSERT @dim([date])
SELECT d
FROM
(
  SELECT
      d = DATEADD(DAY, rn - 1, @StartDate)
  FROM 
  (
      SELECT TOP (DATEDIFF(DAY, @StartDate, @EndDate)) 
          rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
      FROM
          sys.all_objects AS s1
      CROSS JOIN
          sys.all_objects AS s2
      ORDER BY
          s1.[object_id]
  ) AS x
) AS y;

IF OBJECT_ID('tempdb..#dim') IS NOT NULL 

    DROP TABLE #dim

CREATE  TABLE #dim ([date] DATE)

if not @Begin_Date is null and not @End_Date is null

begin
    INSERT #dim([date])
    SELECT d
    FROM(

      SELECT
          d = DATEADD(DAY, rn - 1, @Begin_Date)
      FROM 
      (
          SELECT TOP (DATEDIFF(DAY, @Begin_Date, @End_Date)) 
              rn = ROW_NUMBER() OVER (ORDER BY s1.[object_id])
          FROM
              sys.all_objects AS s1
          CROSS JOIN
              sys.all_objects AS s2
          ORDER BY
              s1.[object_id]
      ) AS x
    ) AS y;
end

CREATE TABLE #t (d DATE)

INSERT INTO #t SELECT GETDATE()

GO

INSERT #t SELECT DATEADD(DAY, -1, MIN(d)) FROM #t

GO 10