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-- young/vet by marketability select tag_cat, sum(rep_tot) rep_tot, sum(score_tot) score_to, sum(users_tot) users_tot, age_cat from (select 'marketable' as tag_cat, users.age age, sum(users.reputation) rep_tot, sum(posts.score) score_tot, count(posts.owneruserid) users_tot, CASE WHEN age >= 15 and age <= 39 THEN 'younger' WHEN age > 39 and age <= 70 THEN 'veteran' END as age_cat from users, posts, posttags, tags where users.age is not null and users.age between 15 and 70 and users.reputation between 2 and 100000 and year(posts.creationdate)=2012 and posts.owneruserid=users.id and posts.id = posttags.postid and posttags.tagid=tags.id and tags.tagname in ('ruby','java','asp.net','linux','python','jquery','iphone','php','c#') group by users.age union select 'nonmarketable' as tag_cat, users.age age, sum(users.reputation) rep_tot, sum(posts.score) score_tot, count(posts.owneruserid) users_tot, CASE WHEN age >= 15 and age <= 39 THEN 'younger' WHEN age > 39 and age <= 70 THEN 'veteran' END as age_cat from users, posts, posttags, tags where users.age is not null and users.age between 15 and 70 and users.reputation between 2 and 100000 and year(posts.creationdate)=2012 and posts.owneruserid=users.id and posts.id = posttags.postid and posttags.tagid=tags.id and tags.tagname in ('vim', 'emacs','arrays','string','scripting','image','algorithm','query','api') group by users.age ) X group by age_cat, tag_cat