Re: What is quicker as Select?

bettina@coaster.ch wrote:

> I read somewhere that to gain efficiency it is advisable to avoid the
> use of select. But they don't explain why or what to use instead. Is it
> true? I habe a problem of speed (better to say of NO SPEED) but I don't
> know if it has something to do with the use of select.
> Waht can I use instead?

Hi,

Not sure, but maybe you misunderstood, and confused the above with SELECT *
and SELECT column1, column2.

SELECT * FROM tblusers;

is slower than

SELECT userid, username FROM tblusers;

So naming the columns is faster than using *, even if you select all
columns.
Reason is that the database has to retrieve the real columnnames first and
replace * with it, before executing the query.

Don't expect huge benefits though.

Besides that: If you use * instead of naming the columns, and the columns
you need are just a small subset of all columns, the naming of columns
clearly will be lot faster because the database has to deliver less data.

Regards,
Erwin Moller
Received on Mon Oct 17 21:12:02 2005