Объединение запросов

SELECT
    COUNT(SUBQ.name) AS count_name
FROM
    (
    SELECT DISTINCT
        products.name AS name
    FROM
        products
    LEFT JOIN (
        SELECT
            id_product
        FROM
            transactions
        WHERE
            CAST(transactions.date AS date) = '2019-06-01') AS SUBQ1 ON products.id_product = SUBQ1.id_product
    WHERE
        SUBQ1.id_product IS NOT NULL
    UNION
    SELECT DISTINCT
        products.name AS name
    FROM
        products
    LEFT JOIN (
        SELECT
            id_product
        FROM
            transactions
        WHERE
            CAST(transactions.date AS date) = '2019-06-08') AS SUBQ2 ON products.id_product = SUBQ2.id_product
    WHERE
        SUBQ2.id_product IS NOT NULL)
AS SUBQ;