[dba-SQLServer] [AccessD] Apples to Oranges

Don't know, but my gut feeling is that a single pass has got to be way more efficient that 540 
of them.

Why not try it on a subset of the records and see how long it takes.


-- 
Stuart

On 5 Oct 2010 at 7:12, jwcolby wrote:

> Stuart,
> 
> Would this really work?  Given that it is simultaneously updating 540+
> fields for 50 million rows, would it ever finish?
> 
> I could have my assistant dynamically create this sql statement if you
> think this is a viable alternative.
> 
> John W. Colby
> www.ColbyConsulting.com
> 
> On 10/4/2010 6:39 PM, Stuart McLachlan wrote:
> > At 1/2 hour / field, it should only take about 11.25 days :-)
> >
> > But my question is, do you have to do it a single field at a time?
> > can't you update all the fields in a single pass? Something like:
> >
> > Update mytable set
> > field1 = case field1
> >                      when " "  then Null
> >                      else field1
> >               end,
> > field2 = case field2
> >                      when " "  then Null
> >                      else field2
> >               end,
> > field3 = case field3
> >                      when " "  then Null
> >                      else field3
> >               end,
> > ...
> >
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