cond = db.mytable(id=someid).select(db.mytable.id) Regards Johann
On 22 January 2014 10:50, Jayadevan M <maymala.jayade...@gmail.com> wrote: > I am checking for existence of record in a table > > cond = db.mytable(id=someid) > if not cond : > do something > > This works fine. The query executed selects *all* columns and adds LIMIT > 1 OFFSET 0; The LIMIT and OFFSET are OK. Since I want to just check for > existence of a record, how can I rewrite this so that we have only the id > column selected? I am trying to avoid a table scan and have just an index > scan. > > -- > Resources: > - http://web2py.com > - http://web2py.com/book (Documentation) > - http://github.com/web2py/web2py (Source code) > - https://code.google.com/p/web2py/issues/list (Report Issues) > --- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to web2py+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- Because experiencing your loyal love is better than life itself, my lips will praise you. (Psalm 63:3) -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
