CREATE TABLE table_6809 ("Name" TEXT, "Position" TEXT, "Number" TEXT, "School/Club Team" TEXT, "Season" TEXT, "Acquisition via" TEXT)

Which season had a trade with the school/club team La Salle?
SELECT "Season" FROM table_6809 WHERE "Acquisition via" = 'trade' AND "School/Club Team" = 'la salle'
SELECT "Season" FROM "table_6809" WHERE "Acquisition via" = 'trade' AND "School/Club Team" = 'la salle'