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SELECT
    c.customers_id,
    c.customers_email_address,
    ci.date_fidelidad_exclusion
FROM
    customers c
        INNER JOIN
    customers_info ci ON ci.customers_info_id=c.customers_id
WHERE
    fidelidad = 0 AND date_fidelidad_exclusion is not null;

SELECT
    c.customers_id,
    c.customers_email_address
FROM
    customers c
        INNER JOIN
    customers_info ci ON ci.customers_info_id=c.customers_id
WHERE
    fidelidad = 0 AND date_fidelidad_exclusion is null;

SELECT
    c.customers_id,
    c.customers_email_address
FROM
    customers c
        INNER JOIN
    customers_info ci ON ci.customers_info_id=c.customers_id
WHERE
    fidelidad = 1;