Re: selecting multiple like-named columns

That said, if you want to do what you mentioned, you can do it
programmatically ...

my $select_list = join(",", map "${_}_sales", qw/chicago nyc boston/);

# That one-liner is the same as:
#   my $select_list = "";
#   my $comma = "";
#   for my $city ("chicago", "nyc", "boston") {
#    $select_list .= $comma . "$city" . "_sales";
#    $comma = ",";
#   }
# 'cause perl rocks the house.

#dynamic sql using DBI
my $SQL = $select_list . " from table";
my $sth = $dbh->prepare($SQL);
$sbh->execute;
for (@col = $sth->fetchrow_array) {
   print join (", ", @col), "\n";
}


--- David Link <dvlink@yahoo.com> wrote:
> You may have denormalized your data, for example if you have one
> table
> like this:
>
> date | chicago_sales | ny_sales | boston_sales | etc
>
> It may be more convenient to store it like this:
>
> date | city | sales
>
> then you can say
>
>   select sales from table where city = 'ny';
>
> or what you want by not specifying a filter:
>
>   select sales from table;
>
> or
>
>   select sum(sales) from table;
>   select sum(sales) from table where city in ('ny', 'chicago');
>
>
> There is only one reason you may want to keep it denormalized  .. and
> that is for performance if the report you need looks like the
> original
> table above.
>
>
> --- "Johnson, Shaunn" <SJohnson6@bcbsm.com> wrote:
> >
> > Howdy:
> >
> > Running PostgreSQL 7.2.1 on RedHat Linux 7.2.
> >
> > Is there a way to do a select for the column
> > names from a table by using some type of
> > wild card?
> >
> > Let's say I have something like column_1, column_2,
> > other_column_1, other_column_2 ...
> >
> > [example]
> >
> > select
> > column_%,
> > other_column_%,
> > from
> > t_table
> > ;
> >
> > [/example]
> >
> > I'm trying to figure out how to get all of the
> > data from the columns that have similar
> > names.
> >
> > Thanks!
> >
> > -X
> >
>
>
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