> On 19 Feb 2015, at 21:39, zach cruise <zachc1...@gmail.com> wrote:
>
> i want to select based on input, but if input is not provided or if
> input is empty, then i want to select all rows.
>
> 1 select *
> 2 from table
> 3 if input = '' then
> 4 where true
> 5 else
> 6 where input = '$sanitized_variable'
> 7 end if;
> (syntax error at 3)
Well yeah, SQL doesn't have an if-statement and you don't need one here:
select *
from table
where ('$sanitized_variable' = '' and input is null)
or ('$sanitized_variable' <> '' and input = '$sanitized_variable');
That can be shortened, but I think the message is clearer this way.
Question though, when do you consider "input" empty? Is that when input = '' or
when input is null?
In the latter case, what's the correct behaviour when '$sanitized_variable' =
''?
Cheers.
Alban Hertroys
--
If you can't see the forest for the trees,
cut the trees and you'll find there is no forest.
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