On Jun 9, 2008, at 11:34 AM, Christoph Zwerschke wrote:
> > I need to order a table by start and end dates, where null values > should > be interpreted as "prior to all values" for start dates and "later > than > all values" for end dates. > > This could be realized with "nulls first", "nulls last", but it seems > this did not make it into SQLAlchemy yet (ticket #723). > > A workaround (for PostgreSQL) would be something like this: > > order_by coalesce(start, timestamp '-infinity'), > coalesce(end_date, timestamp 'infinity') > > But I don't find how to construct this with SQLAlchemy. Any ideas? Any > better solutions? I tend to use a CASE statement for this: CASE WHEN x IS NULL THEN 0 ELSE x . We have case() construct for that. For your version, use func.coalesce(start, literal_column("timestamp '- infinity'")) . --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---