SELECT *
FROM (SELECT YEAR(SalesDate) [Year],
DATENAME(MONTH, SalesDate) [Month],
COUNT(1) [Sales Count]
FROM #Sales
GROUP BY YEAR(SalesDate),
DATENAME(MONTH, SalesDate)) AS MontlySalesData
PIVOT( SUM([Sales Count])
FOR Month IN ([January],[February],[March],[April],[May],
[June],[July],[August],[September],[October],[November],
[December])) AS MNamePivot