Sum Two Columns in Two Mysql Tables

Question

I\'ve been searching everywhere for this but no cigar. Smoke is starting to come out of my ears. please help

How do you sum two columns in two tables and group by us

Answer 1

If you're selecting from 2 tables you need to join them. Otherwise MySQL will not know how to link up the two tables.

select sum(recipe_num_views + meal_num_views) 
from recipe r
inner join meals m ON (r.user_id = m.user_id)
group by m.user_id

See:
http://dev.mysql.com/doc/refman/5.5/en/join.html
http://www.codinghorror.com/blog/2007/10/a-visual-explanation-of-sql-joins.html