[jira] [Commented] (DERBY-6560) Reference manual says ELSE clause is required in CASE expressions

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-6560?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987635#comment-13987635 ] 

Knut Anders Hatlen commented on DERBY-6560:
-------------------------------------------

Thanks, Kim. That looks exactly right. +1 to commit.

> 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
>         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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