如何使用基于日期范围的预测关键字YearMonth制作表

问题描述

这篇文章here中有一个我要在SQL中实现的预测模型。我遇到了几个月缺少值的情况，我想在那几个月里加一个零。因此，我试图创建一个要连接的表，并在一侧为null时插入零。

我在这里询问以下代码，它完全符合我的要求-但这很不错吗？

有改进的想法吗？我还想证明自己不是SQL开发人员，而是供应链经理。 。 。 ：D

IF OBJECT_ID('tempdb..#Year1','U') IS NOT NULL
    /*Then it exists*/
    DROP TABLE #Year1;

IF OBJECT_ID('tempdb..#Year2','U') IS NOT NULL
    /*Then it exists*/
    DROP TABLE #Year2;

IF OBJECT_ID('tempdb..#Year3','U') IS NOT NULL
    /*Then it exists*/
    DROP TABLE #Year3;

DECLARE
    @MinDate date = DATEADD(YEAR,-5,DATEADD(yy,DATEDIFF(yy,GETDATE()) - 1,0)),@MaxDate date = GETDATE();
DECLARE @startnum int = CONCAT(RIGHT(DATEPART(YY,@MinDate),2),FORMAT(DATEPART(MONTH,'0#'));
DECLARE @endnum int = 12;

WITH cteYear1 AS
(
    SELECT @startnum AS num
    UNION ALL
    SELECT num + 1 FROM cteYear1 WHERE num + 1 <= @startnum + 11
)
SELECT * INTO #Year1 FROM cteYear1;

SET @startnum = CONCAT(LEFT(@startnum,2) + 1,RIGHT(@startnum,2));

WITH cteYear2 AS
(
    SELECT @startnum AS num
    UNION ALL
    SELECT num + 1 FROM cteYear2 WHERE num + 1 <= @startnum + 11
)
SELECT * INTO #Year2 FROM cteYear2;

SET @startnum = CONCAT(LEFT(@startnum,2));

WITH cteYear3 AS
(
    SELECT @startnum AS num
    UNION ALL
    SELECT num + 1 FROM cteYear3 WHERE num + 1 <= @startnum + 11
)
SELECT * INTO #Year3 FROM cteYear3;

SELECT * FROM #Year1
UNION
SELECT * FROM #Year2
UNION
SELECT * FROM #Year3;
--Etc. for year 4 & 5

解决方法

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