optimize query with a maximum(date) extraction

Hi all,

I need to improve a query like :

SELECT id, min(the_date), max(the_date) FROM my_table GROUP BY id;

Stupidly, I create a B-tree index on my_table(the_date), witch is logically not used in my query, because it's not with
aconstant ? isn't it ? 

I know that I can't create a function index with an aggregative function.

How I can do ?

thanks,

jsubei




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