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  • But this is not correct if the change was like @MT0 told, true? If the change was from ABC to DEF and back to ABC your query would count 1 change - whereby there were effectively 2. Commented Mar 10, 2021 at 13:02
  • Second, distinct is not sufficient because a change relates only to a NR within a CAT. Commented Mar 10, 2021 at 13:08