Re: IN query operator and NULL values

On May 16, 2008, at 6:54 PM, Alban Hertroys wrote:

> development=> select b, coalesce( (b in (1, null))::text, 'NULL')
> from test;
> b | coalesce
> ---+----------
> 1 | true
> 2 | NULL
> | NULL
> (3 rows)

Just remembered a nice option from psql that doesn't quite clutter my
example as much:

development=> \pset null '<NULL>'
Null display is "<NULL>".
development=> select b, b in (1, null) from test;
b | ?column?
--------+----------
1 | t
2 | <NULL>
<NULL> | <NULL>
(3 rows)

Alban Hertroys

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