On Jan 17, 2007, at 7:34 PM, Roger Clary wrote:

Also, for anything other than quick interactive playing with SQL,
never do "Select *".  Instead, do:

        Select ( column1, column2, ... ) ...

as "Select *" results will change if you ever modify the table
structure.

Thanks, Craig. I didn't know this.

Also in many sql engines defining the columns has a significant impact on performance

Sam D

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