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https://issues.apache.org/jira/browse/DERBY-5557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kim Haase updated DERBY-5557:
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Issue & fix info: Patch Available
> NULLIF topic in reference manual should explain NULLIF
> ------------------------------------------------------
>
> Key: DERBY-5557
> URL: https://issues.apache.org/jira/browse/DERBY-5557
> Project: Derby
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 10.8.2.2
> Reporter: Knut Anders Hatlen
> Assignee: Kim Haase
> Attachments: DERBY-5557.diff, rrefcasenullif.html
>
>
> The section describing NULLIF in the reference manual is a bit cryptic.
> http://db.apache.org/derby/docs/10.8/ref/rrefcasenullif.html
> It says that NULLIF is used for conditional expressions, and that it is
> similar to CASE, but it doesn't say in plain words how it works. It would be
> good if it could mention that NULLIF returns NULL if the two arguments are
> equal, and that it returns the first argument if they are not equal.
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