自动填充CTE在SQL Server

Question

我怎样才能自动填充CTE包含每月 如第一天：

2010年1月1日
2010年2月1日
2010年3月1日
4-1-2010

等等。我正在寻找一个查询来执行此操作，而不是使用UNION运算符。

Answer 1

看一看像

DECLARE @StartDate DATETIME, 
     @EndDate DATETIME 

SELECT @StartDate = '01 Jan 2010', 
     @EndDate = '01 Jan 2011' 

;WITH Dates AS (
     SELECT @StartDate StartOfMonth 
     UNION ALL 
     SELECT DATEADD(month,1,StartOfMonth) StartOfMonth 
     FROM Dates 
     WHERE DATEADD(month,1,StartOfMonth) <= @EndDate 
) 
SELECT * 
FROM Dates 

输出

StartOfMonth 
----------------------- 
2010-01-01 00:00:00.000 
2010-02-01 00:00:00.000 
2010-03-01 00:00:00.000 
2010-04-01 00:00:00.000 
2010-05-01 00:00:00.000 
2010-06-01 00:00:00.000 
2010-07-01 00:00:00.000 
2010-08-01 00:00:00.000 
2010-09-01 00:00:00.000 
2010-10-01 00:00:00.000 
2010-11-01 00:00:00.000 
2010-12-01 00:00:00.000 
2011-01-01 00:00:00.000 

编辑

随着列名提供

DECLARE @StartDate DATETIME, 
     @EndDate DATETIME 

SELECT @StartDate = '01 Jan 2010', 
     @EndDate = '01 Jan 2011' 

;WITH Dates (dt) AS (
     SELECT @StartDate dt 
     UNION ALL 
     SELECT DATEADD(month,1,dt) dt 
     FROM Dates 
     WHERE DATEADD(month,1,dt) <= @EndDate 
) 
SELECT * 
FROM Dates 

Answer 2

WITH CTEDates AS 
(
SELECT CAST('20100101' AS DATETIME) AS DateVal 
UNION ALL 
SELECT DATEADD(mm, 1, DateVal) 
FROM CTEDates 
WHERE DateVal < '20101201' 
) 

SELECT * FROM CTEDates