a guest Dec 12th, 2018 70 Never
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- SELECT DISTINCT c.name
- FROM company.c
- INNER JOIN member m
- ON m.company_name=c.name
- LEFT OUTER JOIN participation p
- ON m.first_name=p.first_name AND m.last_name=p.last_name
- LEFT OUTER JOIN event e
- ON e.event_date=p.event_event_date AND e.name='some-event'
- WHERE NOT e.name IS NULL;
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