[jira] Closed: (DERBY-2441) The documentation for NULLIF could be improved

["Kathey Marsden (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kathey Marsden closed DERBY-2441.
---------------------------------


> The documentation for NULLIF could be improved
> ----------------------------------------------
>
>                 Key: DERBY-2441
>                 URL: https://issues.apache.org/jira/browse/DERBY-2441
>             Project: Derby
>          Issue Type: Task
>          Components: Documentation
>    Affects Versions: 10.3.0.0
>            Reporter: Kathey Marsden
>            Priority: Trivial
>
> The documentation for NULLIF could be improved  as it doesn't explain what NULLIF does at 
> http://db.apache.org/derby/manuals/reference/sqlj66.html#NULLIF+and+CASE+expressions
> I believe the behaviour is that if both arguments are equal it returns NULL otherwise it returns the first value
> e.g.
> NULLIF(L, R)   
> is equivalent to:
> CASE WHEN L=R THEN NULL ELSE L  END

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