mysql left join multiple tables

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Emil
05 May 2020
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
Carolina
03 Aug 2019
1SELECT dashboard_data.headline, dashboard_data.message, dashboard_messages.image_id, images.filename
2FROM dashboard_data 
3    INNER JOIN dashboard_messages 
4        ON dashboard_message_id = dashboard_messages.id
5    INNER JOIN images
6        ON dashboard_messages.image_id = images.image_id
source
Tim
03 Jul 2020
1-- LEFT OUTER JOIN is equivalent to LEFT JOIN
2-- b.VALUE1 is null when ID not in table2 (idem for c.VALUE1 in table3)
3SELECT a.ID, a.NAME, b.VALUE1, c.VALUE1 FROM table1 a 
4  LEFT OUTER JOIN table2 b ON a.ID = b.ID
5  LEFT OUTER JOIN table3 c ON a.ID = c.ID
6WHERE a.ID >= 1000;
7
8-- ⇓ Test it ⇓ (Fiddle source link)
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