Order by multiple columns

my @ints = AppSys::BusinessHours->search( providerid => $provider_id, {order_by => 'intdow'});

I wish to add a second sort criteria, how can I do this?

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You simply add whatever you need to your order_by string:

{ order_by => 'intdow, other_column DESC, yet_another_col' }

This string is passed straight through as SQL, so you can make it as complex as you like.