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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6103) Improve documentation of ROW_NUMBER function
Date Wed, 27 Mar 2013 13:13:21 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13615221#comment-13615221
] 

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

Thanks, Dag!

I am still a bit confused because I don't see the window clause anywhere in the SQL syntax
for a window function. That syntax appears to allow only

ROW_NUMBER() OVER () 

or

ROW_NUMBER() OVER window_name


                
> 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.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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