Question

我有一个Dimension表，我需要在接下来的50年里显示YYYYMM。我确信有一种方法可以在不手动输入数据的情况下执行此操作，但我不确定这样做的适当方法。

我的桌子有

An ID which is an int that will display YYYYMM
the month that will be a varchar(2) to display MM
and the year that will be a varchar(4) to display YYYY

有人能帮我解决这个问题吗？我之前从未真正编写过脚本，我在网上看到的示例更多地显示了日期时间数据类型。

我可能也想在几年前就已经存在的数据开始。我们说2010 - 2070

Answer 1

这对我有用

DECLARE @t TABLE
    (
      id INT ,
      m VARCHAR(2) ,
      y VARCHAR(4)
    )

DECLARE @i INT = 1
DECLARE @today DATE = '20150121'
DECLARE @endDate DATE = DATEADD(YEAR, 50, @today)

WHILE @today <= @endDate
    BEGIN

        INSERT  INTO @t
                ( id ,
                  m ,
                  y
                )
        VALUES  ( CAST(LEFT(CONVERT(CHAR(8), @today, 112), 6) AS INT) ,
                  SUBSTRING(CONVERT(CHAR(8), @today, 112), 5, 2) ,
                  LEFT(CONVERT(CHAR(8), @today, 112), 4)
                )

        SET @today = DATEADD(MONTH, 1, @today)
    END

输出：

id  m   y
201501  01  2015
201502  02  2015
201503  03  2015
201504  04  2015
201505  05  2015
201506  06  2015
201507  07  2015
201508  08  2015
201509  09  2015
201510  10  2015
201511  11  2015
201512  12  2015
201601  01  2016
201602  02  2016
201603  03  2016
      . . .
206410  10  2064
206411  11  2064
206412  12  2064
206501  01  2065

Answer 2

我将使用与stacked cte的计数表执行此操作。试试这个

declare @start_year varchar(4)='2010',@end_year varchar(4)='2070'

;WITH e1(n) AS
(
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL 
    SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1 UNION ALL SELECT 1
), -- 10
e2(n) AS (SELECT 1 FROM e1 CROSS JOIN e1 AS b), -- 10*10
e3(n) AS (SELECT 1 FROM e2 CROSS JOIN e2 AS b), -- 100*100
e4(n) AS (SELECT 1 FROM e3 CROSS JOIN (SELECT TOP 5 n FROM e1) AS b)  -- 5*10000
,e5 as (SELECT Dateadd(Month, Row_number()OVER (
                                  ORDER BY n) - 1, Cast(@start_year + '-01-01' AS DATE)) AS dates
        FROM   e4)

       SELECT Id=LEFT(CONVERT(CHAR(8), dates, 112), 6),
              [Month]=Month(dates),
              [Year]=Year(dates)
       FROM   e5
       WHERE  Year(dates) <= @end_year

用于填充未来50年日期维度表的脚本

2 个答案: