CREATE TABLE table_261927_2 (joined VARCHAR, left VARCHAR, nickname VARCHAR)

What date did the institution that left in 2013 and that is nicknamed Corsairs, join?
SELECT joined FROM table_261927_2 WHERE left = "2013" AND nickname = "Corsairs"
SELECT "joined" FROM "table_261927_2" WHERE "2013" = "left" AND "Corsairs" = "nickname"