SELECT StartTerminal, COUNT(*)
FROM test.2013_q1
GROUP BY StartTerminal;

SELECT StartTerminal, COUNT(*) as TotalCount
FROM (
    SELECT StartTerminal
    FROM test.2013_q1
    GROUP BY StartTerminal
    UNION ALL
        SELECT StartTerminal
        FROM test.2013_q2
        GROUP BY StartTerminal
    )
    GROUP BY StartTerminal;