Time worked only showing one entry per department

Hi,

I'm running a report to show time worked grouped by department, but only seem to be seeing one entry per department rather than a commutative time. Does anyone have any ideas please?

SELECT 'tickets.department', 'Tickets.Ticket Mask ID', 'Tickets.Owner', 'Ticket Billing.Worker', 'Tickets.Subject', 'Tickets.Status', 'Tickets.Type', 'Ticket Billing.Time Spent' FROM 'Ticket Billing', 'Tickets' WHERE 'Ticket Billing.Creation Date' = thisWeek() ORDER BY 'Tickets.Ticket Mask ID' GROUP BY...

Time worked only showing one entry per department