Created
August 25, 2009 19:55
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| SELECT avg(sub.c) FROM ( | |
| SELECT count(DISTINCT split_part(email_address, '@', 2)) AS c | |
| FROM guests | |
| JOIN events ON events.id = guests.event_id JOIN contacts ON guests.contact_id = contacts.id | |
| GROUP BY events.id | |
| ) AS sub |
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