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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6103) Improve documentation of ROW_NUMBER function
Date Mon, 15 Apr 2013 15:20:17 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631789#comment-13631789
] 

Kim Haase commented on DERBY-6103:
----------------------------------

Thanks, Dag.

I guess I am confused about how the syntax for the WINDOW clause can be

   WINDOW window_name window_specification

when the example given does not use that form:

SELECT ROW_NUMBER() OVER R, 
    B, 
    SUM(A) 
FROM T5 GROUP BY B WINDOW R AS ()

Is the example wrong?
                
> Improve documentation of ROW_NUMBER function
> --------------------------------------------
>
>                 Key: DERBY-6103
>                 URL: https://issues.apache.org/jira/browse/DERBY-6103
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 10.10.1.1
>            Reporter: Dag H. Wanvik
>            Assignee: Kim Haase
>            Priority: Minor
>         Attachments: DERBY-6103-2.diff, DERBY-6103-2.stat, DERBY-6103-2.zip, DERBY-6103.diff,
DERBY-6103.stat, DERBY-6103.zip
>
>
> The current documentation doesn't mention that we allow the window definition to be explicit.
> The restriction on WHERE clause no longer applies, nor does the sentence about ORDER
BY not being allowed in subqueries. Cf. rreffuncrownumber.dita. Also, the documentation mentions
that we don't support LIMIT, but not that we now support the FETCH/OFFSET clause, which is
often a better option than ROW_NUMBER.

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