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https://issues.apache.org/jira/browse/DERBY-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12464433
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Tomohito Nakayama commented on DERBY-2239:
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I think next description is not correct in the example ....
-- Arrange the result table in ascending order by average departmental salary.
1 is for WORKDEPT and not AVG(SALARY).
> Example of SelectExpression for GROUP BY clause is mistaken
> -----------------------------------------------------------
>
> Key: DERBY-2239
> URL: https://issues.apache.org/jira/browse/DERBY-2239
> Project: Derby
> Issue Type: Bug
> Components: Documentation
> Environment:
> http://db.apache.org/derby/docs/dev/ref/rrefselectexpression.html
> Reporter: Tomohito Nakayama
>
> There is next example.
> -- List head count of each department,
> -- the department number (WORKDEPT), and the average departmental salary
> (SALARY)
> -- for all departments in the EMPLOYEE table.
> -- Arrange the result table in ascending order by average departmental salary.
> SELECT WORKDEPT, AVG(SALARY)
> FROM EMPLOYEE
> GROUP BY WORKDEPT
> ORDER BY 1
> Comment told that head count of each department is listed, but not exaxtly.
> I think count(*) is needed here.
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