Table: dac_schools
Columns: school
location
mascot
county
enrollment_08_09
ihsaa_class
ihsaa_class_football
year_joined
previous_conference

Question: In what county is the school of Merrillville?
SQL: SELECT "county" FROM dac_schools WHERE "school" = 'merrillville'

Question: The school of Portage was in what conference previous?
SQL: SELECT "previous_conference" FROM dac_schools WHERE "school" = 'portage'

Question: What is the name of the school that is in Valparaiso?
SQL: SELECT "school" FROM dac_schools WHERE "location" = 'valparaiso'