On Friday, August 29, 2003, at 12:36 AM, Williams, Travis L, NEO wrote:
> Performace wise would I be better off just doing 2 query's.. i.e.
> select
> a,b from table1.. then in perl I can check if b is not null and if is
> isn't then I do a second query?
>
> Travis
>
I would say it depends on the table distribution (% of b that are null,
etc). At that point, you're just going to have to experiment, I think,
and see what works best for you. My gut says that even including a
subselect, it will be faster than checking in perl and issuing another
query. But I have no idea, and the proper solution might change
drastically based on your data.
Jeff