salix/print/methods/csv/invoice/sql/invoice.sql

SELECT
    io.id,
    io.clientFk,
    c.email recipient,
    eu.email salesPersonEmail
FROM invoiceOut io
    JOIN client c ON c.id = io.clientFk
    LEFT JOIN account.emailUser eu ON eu.userFk = c.salesPersonFk
    LEFT JOIN ticket t ON t.refFk = io.ref
WHERE t.refFk = ?