Suppose I wanted to be able to perform queries against three columns of my
table: 'user_id', 'product_id' and 'created'. Most of the time I'll just be
range-selecting records from the table ordering by 'created'. But I may also
want to select where 'user_id' = something and 'product_id' in (list, of,
ids), ordered by 'created'. Do I need two separate indexes, one on 'created'
and another on ('user_id', 'product_id', 'created'), or does having only the
latter suffice the former case?-- Jonas, http://jonasgalvez.com.br
