CREATE TABLE table_name_15 (joined VARCHAR2, conference_championships VARCHAR2, nickname VARCHAR2)

What is the year joined with a Conference championships of 5, and a Nickname of wolfpack?
SELECT joined FROM table_name_15 WHERE conference_championships = 5 AND nickname = "wolfpack"
SELECT "joined" FROM "table_name_15" WHERE "conference_championships" = 5 AND "nickname" = "wolfpack"