Re: a need for speed

select area,
       prefix,
       terminal,
       min(suffix),
       max(suffix)
group by area,
         prefix,
         terminal 
order by area,
         prefix,
         terminal 

On 8/18/05, Lim Hock-Chai <Lim.Hock-Chai@xxxxxxxxxxxxxxx> wrote:
> Can below be done without having to read thru each record in detail 
> file(Telephone Master)?
> 
> I need to summarize a big telephone master file (22M+) into ranges.  I'm 
> attempting to use read, reap, setll to avoid the need to read each phone 
> number record to create this summary file.  However, no luck so far.
> 
> The detail file looks like below:
> AreaCode    Prefix    Suffix    Terminal
>  601         123       0001      JSN
>  601         123       0002      JSN
>  601         123       0003      JSN
>  601         123       0004      JSN
>  601         123       0009      BTD
>  601         123       0010      BTD
>  601         123       0044      BTD
>  601         123       0091      JSN
>  601         123       0092      JSN
>  .
>  .
>  .
> 
> 
> The summary file is by AreaCode, Prefix, Terminal, From Suffix, to Suffix.  
> Using above data, the result should be as follow:
> AreaCode    Prefix    Terminal    From Suffix    to Suffix
> 601          123        JSN         0001           0004
> 601          123        BTD         0009           0044
> 601          123        JSN         0091           0092
> 
> 
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