CREATE TABLE table_name_13 (_number___county VARCHAR, year_joined VARCHAR, previous_conference VARCHAR)

Which #/ County has a Year Joined larger than 1926, and a Previous Conference of olympic?
SELECT _number___county FROM table_name_13 WHERE year_joined > 1926 AND previous_conference = "olympic"
SELECT "_number___county" FROM "table_name_13" WHERE "olympic" = "previous_conference" AND "year_joined" > 1926