Oops, I named the var name the same as the column name.  Changing it to
something else solved the problem.

On Tue, 2003-12-16 at 15:54, Stephan Szabo wrote:
> On Tue, 16 Dec 2003, Jenny Zhang wrote:
> > I have stored procedure written in pl/pgsql which takes about 13 seconds
> > to finish.  I was able to identify that the slowness is caused by one
> > update SQL:
> >
> > UPDATE shopping_cart SET sc_sub_total=sc_subtotal, sc_date=now()
> > WHERE sc_id=sc_id;
> Umm, is that exactly the condition you're using? Isn't that going to
> update the entire table?
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>       joining column's datatypes do not match

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