Get the distinct sum of a joined table column

Question

I have a problem here, and I\'m hoping there is an easy solution. I\'ll try to make this as simple as possible:

• A ticket belongs to an attendee
• Exampl

Answer 1

Previous answer is nearly correct. You just need to make distinct work well in case identical revenues. You can fix this really simple if your id has numeric type:

SELECT
  COUNT(*) AS ticketsCount,
  SUM(DISTINCT attendees.id + attendees.revenue) - SUM(DISTINCT attendees.id) AS revenueSum
FROM
  tickets
LEFT JOIN attendees ON
  attendees.id = tickets.attendee_id