Execute the following Microsoft SQL Server T-SQL scripts in SSMS Query Editor to demonstrate the application of Year, Month and Day datetime functions.

-- T-SQL Year, Month & Day functions

DECLARE @Date datetime = '2018-03-15'

-- SQL Server Year function

SELECT YYYY=YEAR(@Date)

SELECT YYYY=DATEPART(yy,@Date)

-- 2018

-- SQL Server Month function

SELECT MM=MONTH(@Date)

SELECT MM=DATEPART(mm,@Date)

-- 3

-- SQL Server Day function

SELECT DD=DAY(@Date)

SELECT DD=DATEPART(dd,@Date)

-- 15

-- YYYYMM aggregation

SELECT YYYYMM=CONVERT(varchar,year(OrderDate))+

       RIGHT('0'+CONVERT(varchar,month(OrderDate)),2),

       MonthlySales=SUM(TotalDue)

FROM AdventureWorks2008.Sales.SalesOrderHeader

WHERE YEAR(OrderDate)>2001

GROUP BY CONVERT(varchar,year(OrderDate))+

         RIGHT('0'+CONVERT(varchar,month(OrderDate)),2)

ORDER BY YYYYMM Desc

/*    YYYYMM      MonthlySales

      200407      56178.9223

      200406      6728034.9873

      200405      6518825.2262

      200404      4722890.7352

      200403      5272786.8106

      200402      5207182.5122

      200401      3691013.2227

*/

-- Alternative solution

SELECT YYYYMM=CONVERT(char(6),OrderDate,112),

       MonthlySales=SUM(TotalDue)

FROM AdventureWorks2008.Sales.SalesOrderHeader

WHERE YEAR(OrderDate)>2001

GROUP BY CONVERT(char(6),OrderDate,112)

ORDER BY YYYYMM Desc

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