Both EdgeQL and SQL disregard the RM proscription about duplicate tuples for practical reasons: 1. Elimination of duplicates from every projection is prohibiti

Both EdgeQL and SQL disregard the RM proscription about duplicate tuples for practical reasons: 1. Elimination of duplicates from every projection is prohibitively expensive. 2. Sometimes you actually _want_ duplicates to show up without injecting a synthetic key into every projection. 3. There's DISTINCT.