Table: frat_soror
Columns: letters
organization
nickname
founding_date
founding_university
type

Question: what type of organization is sigma phi omega?
SQL: SELECT "type" FROM frat_soror WHERE "organization" = 'Sigma Phi Omega'

Question: how many types of organization were founded in san diego state university? 
SQL: SELECT COUNT("type") FROM frat_soror WHERE "founding_university" = 'San Diego State University'

Question: name the sorority a.k.a. "sigmas" that was founded in the university of southern california.
SQL: SELECT "organization" FROM frat_soror WHERE "founding_university" = 'University of Southern California' AND "type" = 'Sorority' AND "nickname" = '"Sigmas"'