On 10-05-2016 22:28, David G. Johnston wrote:
> Technically "is not distinct from" would be more correct.
>
Ooops. Fat fingered the statement. Also, forgot to consider null case.
euler=# \pset null 'NULL'
Null display is "NULL".
euler=# select x.a, y.b, x.a IS NOT DISTINCT FROM y.b AS "INDF", x.a =
y.b AS "=" FROM (VALUES (3), (6), (NULL)) AS x (a), (VALUES (3), (6),
(NULL)) AS y (b);
a | b | INDF | =
------+------+------+------
3 | 3 | t | t
3 | 6 | f | f
3 | NULL | f | NULL
6 | 3 | f | f
6 | 6 | t | t
6 | NULL | f | NULL
NULL | 3 | f | NULL
NULL | 6 | f | NULL
NULL | NULL | t | NULL
(9 rows)
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Euler Taveira Timbira - http://www.timbira.com.br/
PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento
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