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Join Tables with limit

Author

Topic

IDILIO49
Starting Member

1 Post

Posted - 2012-12-30 : 00:48:43

I have 3 tables and need to do a join with the 3 but with a limit for one of them.
Lets say:
Table Persons
Table Cars
Table Childs

I want to see a line for every combination Person / Child / Car (but only for the last 4 cars)

This can be the query for all combinations

select p.name, c.name, r.name from Persons p, Childs c, Cars r where p.id=c.parentid and p.id=r.ownerid

but now the question is how can I limit this to show only combinations for the most recent 4 Cars.date for that Person?

sodeep
Master Smack Fu Yak Hacker

7174 Posts

Posted - 2012-12-30 : 10:01:05

[code]Select p.name, c.name, r.name
from
(
Select p.name, c.name, r.name,ROW_NUMBER() OVER (PARTITION BY P.Name Order by r.date desc) as Seq
from Persons p
inner join Childs c on p.id = c.parentid
inner join Cars r on p.id = r.ownerid
)T
Where T.Seq <=4[/code]

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