Re: How to create index on only some of the rows - Mailing list pgsql-general

On Feb 7, 2011, at 11:00 PM, A B wrote:
> So until this changes, can you just add a boolean field to tell if the
> column should be used in the index, and then run  "create index ....
> where use_in_index = true"  or are there other (better?) ways of doing
> this?


If you want you can do that Or You can use proper where clause as given below:
CREATE INDEX indexname on tablename(columname) where condition;

example:
create index directed_graph_idx on directed_graph(node_from) where node_from in ('A','B');

Thanks & Regards,
Vibhor Kumar
vibhor.kumar@enterprisedb.com
Blog:http://vibhork.blogspot.com