-- # $Id$
-- # $HeadURL$
-- # $Author$

-- View for showing exerciseState changes
DROP VIEW IF EXISTS exm.getExerciseStateChanges;
CREATE VIEW exm.getExerciseStateChanges AS
(
  SELECT e.name AS ex_name, e.id AS exercise_id, 
         s1.id AS s1_id, es1.name || '-' || s1.exercise_state_id AS state_old,
         s2.id AS s2_id, es2.name || '-' || s2.exercise_state_id AS state_new
  FROM exm.exercise_state_change s1, exm.exercise_state_change s2,
       exm.exercise_state es1, exm.exercise_state es2,
       exm.exercise e
  WHERE s2.id - 1 = s1.id
    AND e.id = s1.exercise_id
    AND es1.id = s1.exercise_state_id
    AND es2.id = s2.exercise_state_id
);