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

[Knut Anders Hatlen (JIRA)]

Knut Anders Hatlen created DERBY-6560:
-----------------------------------------

             Summary: 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
            Priority: Minor


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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