I haven't even had 3 hours of hands on time with SQL yet, so I'm sorry if this comes off sounding like a very noobish question, but I can't figure out what I need to do to take the number returned by this query: Code: SELECT description, deaths1 FROM who.deaths INNER JOIN who.icd9 ON who.deaths.cause = who.icd9.cause where sex = 2 and country in (SELECT country FROM who.country where country_name like '%united kingdom%') and ryear = 1980 and deaths1 > 0 group by who.icd9.cause order by deaths1 desc limit 1; And divide it by a number returned by a different query. Specifically, the question from my homework assignment is The query I wrote above returns what the leading cause of death is for the United Kingdom Females from 1980, but now I need to sum all of the deaths for the United Kingdom Females from 1980 and then divide it by that. I can't make what I've already written a subquery, because MySQL complains that it doesn't support limits inside of subqueries. Suggestions? Edit: Alright, I can separately find the sum of all UK female deaths from 1980 with this query: Code: SELECT SUM(deaths1) deaths1 FROM who.deaths where sex = 2 and country in (SELECT country FROM who.country where country_name like '%united kingdom%') and ryear = 1980; I don't know how to divide one by the other, though.