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https://issues.apache.org/jira/browse/DERBY-6103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13635987#comment-13635987
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Dag H. Wanvik commented on DERBY-6103:
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Thanks, Kim! The syntax looks correct now. We can probably defer factoring out
WindowSpecification to a separate topic since its currently trivial. Just two
more nits and we should be done:
ROW_NUMBER function topic:
"You can specify a WindowName in order to use a WINDOW clause in a
SelectExpression. "
This sentence, while correct, sounds a bit rationale inverted: One would use a
WindowName iff one chose to use an explicit WindowClause in a SelectExpression
rather than using an implicit (inlined) window specification. Currently, this
possibility doesn't give you much, admittedly, but it's legal SQL syntax.
Window Clause topic:
"Currently, the only valid WindowSpecification is a set of empty parentheses
(())."
Correct, but we should add that this means that the effective window is the
entire result set - as you do say in the ROW_NUMBER function topic.
> 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-6103-3.diff, DERBY-6103-3.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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