How to write this SQL statement? - mysql

Question

Here is the table:
User
Name: Subject:
Peter Math
Mary Chinese
Mary Computer
Mary Hist
Mary PE
Mary English
Peter Art
Chris English
Chris Computer
Peter Computer
Paul Math
I would like to get the the top appear in name, and return top 4 result should be subject name. For example, in this case top appear name is Mary, and base on the order in subject, the Chinese , Computer, English, so I would like to have the result:
Mary Chinese
Mary Computer
Mary English
Mary Hist
If Mary is not the most enough to show the result, the second people will be the follow, like, let say the table will like this:
Name: Subject:
Peter Math
Mary Chinese
Mary Computer
Mary Hist
Peter Art
Chris English
Chris Computer
Peter Computer
Paul Math
The result will be,
Mary Chinese
Mary Computer
Mary Hist
Peter Art
Because Mary is the most appear, so Mary will return, but Mary is not enough to fill in 4 positions, so the second most appear will take the place, in this case, we use Peter.

Answer 1

SELECT user.name, user.subject
FROM user
INNER JOIN (
SELECT name, COUNT(1) AS occurrences
FROM user
GROUP BY name
) AS user_occurrences
ON user.name = user_occurrences.name
ORDER BY user_occurrences.occurrences DESC, user.name ASC, user.subject ASC
LIMIT 4
edit This might perform better, depending on the RDBMS you're using and the size of the dataset. Try both and compare.
SELECT user.name, user.subject
FROM user
INNER JOIN user AS user_occurrences
ON user.name = user_occurrences.name
GROUP BY user.name --, user.subject Second GROUP BY not needed on MySQL, but it should logically be there
ORDER BY COUNT(user_occurrences.subject) DESC, user.name ASC, user.subject ASC
LIMIT 4

Answer 2

select top 4 from group by Name, Subject and sort by count
MSSQL Code:
select top 4 q.marketname, cc.countryname from (
select top 100 m.MarketName, m.MarketId, COUNT(m.marketname) as [count]
from Common.Country c inner join Common.Market m on c.MarketId = m.MarketId
group by m.MarketName, m.MarketId order by COUNT(m.marketname) desc)
q inner join Common.Country cc
on cc.MarketId = q.MarketId order by [Count] desc
You can make similar mySQL code
Here is relevent MySQL Code
select q.name, cc.subject from (
select m.Name, count(*) as Count
from User m
group by m.Name
order by COUNT(*) desc
LIMIT 100
) q
inner join user cc on cc.Name= q.name
order by Count desc
LIMIT 4
This is weired, you want solution with no effort? Can't you implemet logic in your technology? You should not downvote without understanding solution suggested.