sql - Get the highest odds from the last update -


i have these tables in postgresql database:

bookmakers

----------------------- | id   | name         | ----------------------- | 1    | unibet       | ----------------------- | 2    | 888          | -----------------------

odds

--------------------------------------------------------------------- | id  | odds_type  | odds_index  | bookmaker_id | created_at        | --------------------------------------------------------------------- | 1   | 1          | 1.55        | 1            | 2012-06-02 10:30  | --------------------------------------------------------------------- | 2   | 2          | 3.22        | 2            | 2012-06-02 10:30  | --------------------------------------------------------------------- | 3   | x          | 3.00        | 1            | 2012-06-02 10:30  | --------------------------------------------------------------------- | 4   | 2          | 1.25        | 1            | 2012-05-27 09:30  | --------------------------------------------------------------------- | 5   | 1          | 2.30        | 2            | 2012-05-27 09:30  | --------------------------------------------------------------------- | 6   | x          | 2.00        | 2            | 2012-05-27 09:30  | ---------------------------------------------------------------------

what trying query following:

give me 1/x/2 odds latest update (created_at) bookmakers , last update, give me highest odds each odds_type ('1', '2', 'x').

on website display them as:

best odds right now:   1   |   x   |   2                      --------------------                      2.30  |  3.00 | 3.22

i have first latest, because odds update yesterday no longer valid. last update, have - in case - 2 odds 2 different bookmakers, need best 1 type '1','2','x'.

pseudo sql like:

select max(odds_index) odds_type = '1' order created_at desc, odds_index desc

but doesn't work, because latest odds (and not highest/best latest)

i hope i'm making sense.

subqueries rescue!

select o1.odds_type, max(o1.odds_index) odds o1 inner join (select odds_type, max(created_at) created_at             odds group odds_type) o2 on o1.odds_type = o2.odds_type , o1.created_at = o2.created_at group o1.odds_type

sqlfiddle: http://sqlfiddle.com/#!3/47df4/3


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