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From "Knut Anders Hatlen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5557) NULLIF topic in reference manual should explain NULLIF
Date Wed, 11 Apr 2012 07:16:25 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13251381#comment-13251381
] 

Knut Anders Hatlen commented on DERBY-5557:
-------------------------------------------

I agree with Dag that it's probably OK to call COALESCE and NULLIF functions. CASE, on the
other hand, isn't a function, so it might make sense to move "CASE expression" to the "SQL
expressions" topic.
                
> 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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