Re: Function fixing - PostgreSQL 9.2

On 1 March 2016 at 11:35, David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com>
wrote:

> On Mon, Feb 29, 2016 at 2:56 PM, drum(dot)lucas(at)gmail(dot)com <
> drum(dot)lucas(at)gmail(dot)com> wrote:
>
>> *Question:*
>>
>> Payments in a Pending state cannot be invoiced and are excluded from the
>> Invoice Runs section, but they are showing in the count mechanic.
>>
>> How can I solve this?
>>
>
> ​In 9.2 you probably need to convert the count into a conditional sum:
>
> SELECT sum(CASE WHEN <boolean> THEN 1 ELSE 0 END) FROM data;
>
> You can probably do the same with count since it excludes nulls.
>
> SELECT count(NULLIF(invoice_status, 'Pending') FROM invoices;
>
> ​9.4 introduced a FILTER clause for Aggregate Expressions that can do this
> much more cleanly and efficiently.​
>
> ​http://www.postgresql.org/docs/9.4/static/sql-expressions.html​
>
> David J.
>
>
Thank you David...

Can you please show me how it would be with the new changes?

Thanks