> Hello all,
>
> does anyone have any feedback whether there is any difference in the
> efficiency of the following query on a fairly large dataset
>
> 1. select * from tbl
This will be the slowest.
> 2 select count(*) from tbl
This will be very fast since MySQL is optimized for it (the number is
updated when a row is inserted, so the query doesn't actually count all the
rows).
> 3. select field1,field2,field3 from tbl
This will be faster than select * since it doesn't have to fetch as much
data.
See http://www.mysql.com/doc/Q/u/Query_Speed.html for more information.
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