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我试图获得从本月初(上一年)到当天(上一年)的日期范围.有没有办法简化这段代码？

SELECT 'From the beginning of month to this day, previous year' AS Label,
       CONVERT (DATETIME, CAST (DATEPART(YY, GETDATE()) - 1 AS CHAR (4)) + CASE 
                                                                           WHEN DATEPART(MM, GETDATE()) < 10 THEN '-0' + CAST (DATEPART(MM, GETDATE()) AS CHAR (1)) ELSE '-' + CAST (DATEPART(MM, GETDATE()) AS CHAR (2)) 
                                                                           END + '-01') AS Begin_date,
       CONVERT (DATETIME, CAST (DATEPART(YY, GETDATE()) - 1 AS CHAR (4)) + CASE 
                                                                           WHEN DATEPART(MM, GETDATE()) < 10 THEN '-0' + CAST (DATEPART(MM, GETDATE()) AS CHAR (1)) …