mysql select and count left join

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Simona
17 Aug 2017
1select
2  t.Topic,
3  t.Title,
4  count(distinct s.starID) as StarCount,
5  count(distinct m.User) as UserCount,
6  count(distinct m.messageID) as MessageCount
7from
8  Topics t
9  left join Messages m ON m.Topic = t.Topic
10  left join Stars_Given s ON s.Topic = t.Topic
11group by
12  t.Topic,
13  t.Title
source
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