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Syntax

CASE { simple_case_expression
     | searched_case_expression
     }
     [ ELSE else_expression ]
     END

simple_case_expression::=
     expr WHEN comparison_expr
          THEN return_expr
          [ WHEN comparison_expr
            THEN return_expr ]...

searched_case_expression::=
     WHEN condition THEN return_expr
     [ WHEN condition THEN return_expr ]...