Table: college_hockey_teams_3
Columns: institution
location
founded
affiliation
enrollment
nickname

Question: Which institution is private/catholic?
SQL: SELECT "institution" FROM college_hockey_teams_3 WHERE "affiliation" = 'private/catholic'

Question: What is the average enrollment of the Redbirds' school?
SQL: SELECT AVG("enrollment") FROM college_hockey_teams_3 WHERE "nickname" = 'redbirds'

Question: What is Southern Illinois University Edwardsville's affiliation?
SQL: SELECT "affiliation" FROM college_hockey_teams_3 WHERE "institution" = 'southern illinois university edwardsville'