StrataScratch
Find all the songs that were top-ranked (at first position) at least once in the past 20 years.
table name: billboard_top_100_year_end

Solution:
select distinct song_name from billboard_top_100_year_endwhere year_rank=1 and year >= Year(GETDATE()) - 20
group by song_name
Output:
where YearGETDATE
group by

SQL Script:
Script File