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From "Christian d'Heureuse (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1575) document full syntax of CASE expression
Date Tue, 29 Aug 2006 22:04:23 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1575?page=comments#action_12431389 ] 
            
Christian d'Heureuse commented on DERBY-1575:
---------------------------------------------

The new patch looks fine. Thanks for your work.

> document full syntax of CASE expression
> ---------------------------------------
>
>                 Key: DERBY-1575
>                 URL: http://issues.apache.org/jira/browse/DERBY-1575
>             Project: Derby
>          Issue Type: Improvement
>          Components: Documentation
>            Reporter: Christian d'Heureuse
>         Assigned To: Kim Haase
>         Attachments: DERBY-1575.diff, DERBY-1575_fix.diff, rrefcasenullif.html
>
>
> The documentation at http://db.apache.org/derby/docs/dev/ref/rrefcasenullif.html describes
the CASE expression syntax as:
>    CASE WHEN BooleanExpression THEN thenExpression ELSE elseExpression END
> But the CASE expression supports more than one WHEN/THEN clauses.
> I suggest to change the syntax description to:
>    CASE
>       WHEN BooleanExpression THEN Expression
>     [ WHEN BooleanExpression THEN Expression ]
>       ...
>       ELSE elseExpression
>    END
> Example:
>    VALUES
>       CASE
>          WHEN 1 = 2 THEN 3
>          WHEN 4 = 5 THEN 6
>          ELSE 7
>       END

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