CREATE TABLE table_49508 ("Teams" TEXT, "Finals appearances" FLOAT, "Championships" FLOAT, "Runners-up" FLOAT, "Years won" TEXT, "Years runners-up" TEXT)

Who won the ABA Championship in 1971?
SELECT MIN("Championships") FROM table_49508 WHERE "Years won" = '1971'
SELECT MIN("Championships") FROM "table_49508" WHERE "Years won" = '1971'