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From "Kim Haase (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-6560) Reference manual says ELSE clause is required in CASE expressions
Date Fri, 02 May 2014 14:47:16 GMT

     [ https://issues.apache.org/jira/browse/DERBY-6560?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kim Haase resolved DERBY-6560.
------------------------------

          Resolution: Fixed
       Fix Version/s: 10.11.0.0
    Issue & fix info:   (was: Patch Available)

Thanks, Knut!

Committed patch DERBY-6560.diff to documentation trunk at revision 1591933. 

I can backport it if you think it worthwhile. Let me know. 

> Reference manual says ELSE clause is required in CASE expressions
> -----------------------------------------------------------------
>
>                 Key: DERBY-6560
>                 URL: https://issues.apache.org/jira/browse/DERBY-6560
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 10.10.2.0
>            Reporter: Knut Anders Hatlen
>            Assignee: Kim Haase
>            Priority: Minor
>             Fix For: 10.11.0.0
>
>         Attachments: DERBY-6560.diff, rrefcase.html
>
>
> The reference manual topic on the CASE expression says the syntax is
> {noformat}
> CASE 
>   WHEN booleanExpression THEN thenExpression 
>   [ WHEN booleanExpression THEN thenExpression ]*
>   ELSE elseExpression 
> END
> {noformat}
> The ELSE clause is optional and should be in square brackets, as seen by this example:
> {noformat}
> ij> values case when (1<>1) then 'yes' end;
> 1   
> ----
> NULL
> 1 row selected
> {noformat}
> This seems to comply with the SQL standard, as the syntax rules for <case expression>
say that "\[if\] an <else clause> is not specified, then ELSE NULL is implicit."



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