Description of the illustration simple_case_statement

CASE selector WHEN (selector_value | dangling_predicate) 
  [, selector_value | dangling_predicate]... THEN statement[statement]...; 
    [WHEN (selector_value | dangling_predicate) 
      [, selector_value | dangling_predicate]... THEN statement[statement]...;]...
  [ELSE statement[statement]...] END CASE [label] ;