Question

I have a table in which the first two rows are Company, Year. Each company will have some years, but not necessarily all of them:

ABC | 2010
ABC | 2011
ABC | 2012
BBC | 2011 //does not have all the years, don't want to select it

I’d like to select a list of companies which have ALL the years (not just some of them), but I’m having trouble writing a select query to do that. I imagine this is really easy but I can’t figure it out for some reason.

Answer 1

try

select company
from your_table
group by company
having count(distinct year) = (select count(distinct year) from your_table)