Using case expressions in update set clause - Mailing list pgsql-general

I just want to clarify that the following will always behave the way I
think it's supposed to behave:-

     update  tableA
     set       date_field = case when date_field is null then some_date
                                          else date_field end;

If the current value of date_field for the current record is null then
set the date_field with some_date value otherwise keep the current
value of date_field.

Note: in the actual situation there'll be other fields that will
always be updated in addition to this one field that needs to be
conditionally updated.


Chris
--
Chris Velevitch
Manager - Sydney Flash Platform Developers Group
m: 0415 469 095
www.flashdev.org.au