变量中select语句的SQL存储值 [英] SQL store value of select statement in variable

问题描述

使用以下代码打印出前12个月，但它会在tabe中的一列中填充。如何在变量中填充这12个月？我应该尝试使用while循环吗？

have the below code which prints out the previous 12 months however it populates in one column in a tabe. How do I get these 12 months to be populated within a variable? Should I try using a while loop?

declare @date date = '03 December 2015'
;WITH T AS(
SELECT 
    DATEADD(month, -1, @date) AS Start,
    12 Cnt
    UNION ALL
SELECT 
     DATEADD(month, -1, Start),
     Cnt-1
FROM T
WHERE Cnt-1>=0
)

SELECT     case when  LEN(MONTH(Start)) = 1 then  substring( cast(YEAR(start) as varchar(6))  + right('0',1)+ cast(MONTH(Start) as varchar(6)),1,10)
else   substring( cast(YEAR(start) as varchar(6))  + cast(MONTH(Start) as varchar(6)),1,10) end [YearMonth]
FROM    t

推荐答案

我已在解决方案中进行了更改。而不是提供整数输入我建议在日期提供输入，如2014年2月1日'而不是201402.

I have made changes in the solution. Instead of providing input as integer I suggest to provide input in date like 01-Feb-2014' instead of 201402.

DECLARE @TBL_MONTH DATETIME, @NAME AS VARCHAR(20), @CurrentMonth INT, @TMP_MONTH DATETIME,
		@Table_Name VARCHAR(20)

SELECT @TBL_MONTH = '01-FEB-2014', @CurrentMonth = 12

WHILE @CurrentMonth > 0
BEGIN
	
	SET @CurrentMonth = @CurrentMonth - 1

	SET @TMP_MONTH = DATEADD(month, @CurrentMonth*-1,  @TBL_MONTH)

	SELECT @NAME = CONVERT(VARCHAR(6), @TMP_MONTH,  112)

	PRINT @NAME
	
	SELECT @Table_Name = 'xx_'+@NAME

	PRINT @Table_Name

END

它给你你想要什么。

It gives you what you wanted.

DECLARE @FirstTableMonth varchar(6) =  201402
DECLARE @inDate Date , @toDate Date

SET @inDate = Convert(DATE, @FirstTableMonth + '01')


SET @toDate =    DATEADD(month, -10,@inDate)

;with months (idate)
AS
(
    SELECT @inDate

    UNION ALL

    SELECT DATEADD(month,-1,isnull(idate,@inDate))
    from months
    where idate >= @toDate
)
select  CONVERT(CHAR(6), idate, 112)  from months
option (maxrecursion 0)

201402

201401

201312

201311

201310

201309

201308

201307

201306

201305

201304

201303

201402
201401
201312
201311
201310
201309
201308
201307
201306
201305
201304
201303

declare @date date = '03 December 2015'
declare @list varchar(500)
SET @list = (SELECT   LEFT(CONVERT(VARCHAR,DATEADD(MM, -1*number, @date),112),6) + CHAR(10)
FROM    master.dbo.spt_values
WHERE TYPE = 'P' and number between 1 and 12
for xml path(''))
select @list

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