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From "Rainer Gemulla (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-131) AVG precision is INTEGER instead of DOUBLE
Date Tue, 25 Jan 2005 18:40:17 GMT
     [ http://issues.apache.org/jira/browse/DERBY-131?page=comments#action_58060 ]
     
Rainer Gemulla commented on DERBY-131:
--------------------------------------

Maybe you are right. I quickly checked the AVG() function in commercial database systems.
IBM DB2 returns an integer (as Derby), while Oracle returns a double.  Therefore, maybe it's
best to leave it as it is. But, most probably, users will not be aware of this behaviour and
therefore they may not get the results they expected.

> AVG precision is INTEGER instead of DOUBLE
> ------------------------------------------
>
>          Key: DERBY-131
>          URL: http://issues.apache.org/jira/browse/DERBY-131
>      Project: Derby
>         Type: Bug
>   Components: SQL
>     Versions: 10.0.2.1
>     Reporter: Rainer Gemulla

>
> The AVG aggregator returns an INTEGER value, if the data tyoe of the respective attribute
is INTEGER. This is wrong, because the average of a set of integers is not always an integer,
too.

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