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.Titlesql query for getting data with join and count
Correlated subquery
SELECT job_Desc
,(select count(*) from employee where employee.job_id = jobs.job_id) as count
FROM Jobs
ORDER BY 2
refrence:
https://azagappan.wordpress.com/2006/06/23/using-count-with-joins/#:~:text=COUNT(*)%20returns%20the%20number,number%20of%20unique%2C%20nonnull%20values.Copyright © 2021 Codeinu
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