Mysql random rows from all values of another table -

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i have table 15,000 rows each having unique id , table b 10,000,000 rows multiple rows each unique id in table a. need check table b each id table , select 1 random row each of matching ids. once query runs end 15,000 random rows table b (each unique table id).

i'd assume intense rand() alone or loop it's got involved select.

looked involves 1 table http://explainextended.com/2009/03/01/selecting-random-rows/

not able adjust need.

what this?

select distinct b.a_id b inner join on a.id = b.id order rand(10000000)

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