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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-1576) Extend the CASE expression syntax for "simple case"
Date Fri, 16 May 2014 15:03:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13999869#comment-13999869
] 

Dag H. Wanvik commented on DERBY-1576:
--------------------------------------

Thanks, Knut! Nice cleanup and improvement; +1

> Extend the CASE expression syntax for "simple case"
> ---------------------------------------------------
>
>                 Key: DERBY-1576
>                 URL: https://issues.apache.org/jira/browse/DERBY-1576
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Christian d'Heureuse
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>              Labels: derby_triage10_11
>         Attachments: d1576-1a.diff, simple-simple.diff
>
>
> The ISO/IEC 9075-2:1999 SQL standard describes two kinds of CASE expressions: "simple
case" and "searched case".
> The current Derby version supports "searched case" but not "simple case".
> The syntax for "simple case" is:
>    CASE Expression
>       WHEN Expression THEN Expression
>     [ WHEN Expression THEN Expression ]
>       ...
>       ELSE ElseExpression
>    END
> Example:
>    VALUES
>       CASE 4
>          WHEN 1 THEN 'one'
>          WHEN 2 THEN 'two'
>          WHEN 3 THEN 'three'
>          ELSE 'many'
>       END



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