On Sat, 2007-01-20 at 09:34 +1100, Gavin Sherry wrote: > On Sat, 19 Jan 2007, Karen Hill wrote: > > > Gavin Sherry wrote: > > > Recenly, I've been researching and putting together a proposal for window > > > functions.
Good news. > > Implementing NULLS FIRST and NULLS LAST appears like another > > challenging step to getting window functions wrapped up. Has your > > research lead you to any ideas on what your strategy for NULLS FIRST > > and NULLS LAST likely would be? > > Explicit handling of NULL is only in the Oracle extension to window > functions. I will look at the core SQL functionality first -- maybe with > the extension of 'LEAD' and 'LAG' because they are heavily utilitised by > those using window functions. NULLS FIRST | LAST is part of SQL:2003, specifically the definition of a window over which an aggregate function can be applied contains a sort specification list. > Besides, Tom's been working on NULLS FIRST/LAST already. For that very reason, I imagined. -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org
