How to find the record in a table that contains the maximum value?

Question

Although this question looks simple, it is kind of tricky.

I have a table with the following columns:

table A:
  int ID
  float value
  datetime date         


        

Answer 1

You could try with a subquery

select group, id, value, date from A where date in
( select MAX(date) as date
  from A
  group by group )
order by group