Re: IS NULL seems to return false, even when parameter is NULL

Richard,

> Seems to work here:
>
> select (true or null) as a, (null or true) as b, (null or false) as c,
> (false or null) as d;
> a | b | c | d
> ---+---+---+---
> t | t |   |
> (1 row)

I'm sorry for the wrong information.

Andrus.