PostgreSQL 'NOT IN' and subquery

postgresql subquery
skowron-line picture skowron-line · Dec 11, 2011 · Viewed 140.4k times · Source

I'm trying to execute this query:

SELECT mac, creation_date 
FROM logs 
WHERE logs_type_id=11
AND mac NOT IN (select consols.mac from consols)

But I get no results. I tested it, and I know that there is something wrong with the syntax. In MySQL such a query works perfectly. I've added a row to be sure that there is one mac which does not exist in the consols table, but still it isn't giving any results.

Answer

Mark Byers picture Mark Byers · Dec 11, 2011

When using NOT IN you should ensure that none of the values are NULL:

SELECT mac, creation_date 
FROM logs 
WHERE logs_type_id=11
AND mac NOT IN (
    SELECT mac
    FROM consols
    WHERE mac IS NOT NULL -- add this
)

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