On 08/15/13 16:59, Adrian Klaver napisa:
On 08/15/2013 07:53 AM, Ivan Radovanovic wrote:
Now I just need to find out which types can be indexed (and which types
can be part of PK)
http://www.postgresql.org/docs/9.2/interactive/indexes.html
doesn't list which types can be indexed and which can't?
Postgres can handle a variety of indexes including indexing on
expressions, which is why I pointed you to that link.
To cut to the chase, in the above link at:
http://www.postgresql.org/docs/9.2/interactive/indexes-opclass.html
there is this:
SELECT am.amname AS index_method,
opf.opfname AS opfamily_name,
amop.amopopr::regoperator AS opfamily_operator
FROM pg_am am, pg_opfamily opf, pg_amop amop
WHERE opf.opfmethod = am.oid AND
amop.amopfamily = opf.oid
ORDER BY index_method, opfamily_name, opfamily_operator;
Thanks Adrian, but question was how to decide which types are indexable
- query which you sent returns list of operators defined for some types
- for example it returns operators for bytea too, and you can't index by
bytea, so I don't see how you could decide if type can be indexed based
on this?
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