mysql select and count left join
select
t.Topic,
t.Title,
count(distinct s.starID) as StarCount,
count(distinct m.User) as UserCount,
count(distinct m.messageID) as MessageCount
from
Topics t
left join Messages m ON m.Topic = t.Topic
left join Stars_Given s ON s.Topic = t.Topic
group by
t.Topic,
t.Titleuse of where in left join in mysql
SELECT bk1.book_name,bk1.isbn_no,bk1.book_price,bk1.pub_lang
FROM book_mast bk1
LEFT JOIN book_mast bk2 ON bk1.book_price<bk2.book_price
WHERE bk2.pub_lang='German';Copyright © 2021 Codeinu
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