Multiple max values in a query

Question

I know the title does not sound very descriptive, but it is the best I could think of:

I have this table

ID     BDATE      VALUE
28911  14/4/2009  44820
2         


        

Answer 1

You can use an INNER JOIN to filter out only the maximum rows:

select t.*
from YourTable t
inner join (
     select id, max(bdate) as maxbdate
     from YourTable
     group by id
) filter
    on t.id = filter.id
    and t.bdate = filter.maxbdate

This prints:

id     bdate       value
38605  2009-04-23  6936575
38537  2009-04-22  81098692
28911  2009-04-24  7749594.67

Note that this will return multiple rows for an id which has multiple values with the same bdate.