Re: Function fixing - PostgreSQL 9.2 - Mailing list pgsql-general

On Mon, Feb 29, 2016 at 2:56 PM, drum.lucas@gmail.com <drum.lucas@gmail.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.