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https://issues.apache.org/jira/browse/DERBY-1576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13985333#comment-13985333
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Lukas Eder commented on DERBY-1576:
-----------------------------------
Hmm, apart from MS Access (which doesn't have a CASE expression at all), Derby
is the only database among the 16 databases supported by <a
href="http://www.jooq.org";>jOOQ</a>, which doesn't support this syntax.
Is there any particular reason why this was omitted so far? I suspect that a
canonical implementation would be merely syntactic sugar, implemented in the
parser...
> 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
> Priority: Minor
> Labels: derby_triage10_11
>
> 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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