Question

The following query worked in Sybase SQL: –

select id, version from local_tbl
group by id
having version < max(version)

It gets me all id’s and versions except for the maximum.

When i try the same query in Postgres 9.1, i get the following error message: –

Error: ERROR: column "local_tbl.version" must appear in the GROUP BY clause or be used in an aggregate function

I can’t put the version in the group by as i want all of the versions for an id.

How can i do the equivalent?

Answer 1

Try:

SELECT id, version
FROM (
      select id, 
             version, 
             max(version) OVER (PARTITION BY id) as max_version
      from local_tbl ) sub
WHERE version < max_version