Finding the decade with largest records, SQL Server

Question

I have the following db diagram :

I want to find the decade (for example 1990 to 2000) that has the most number of movies. Actually it only deals with "

Answer 1

An alternative to the string approach is to use integer division to get the decade:

SELECT [Year]/10*10 as [Decade]
     , COUNT(*) as [CountMovies]
FROM Movies
GROUP BY [Year]/10*10
ORDER BY [CountMovies] DESC

This returns all, ordered by the decade(s) with the most movies. You could add a TOP (1) to only get the top, but then you'd need to consider tiebreaker scenarios to ensure you get deterministic results.