I've used intersections and unions with sql. And also Cartesian products (a cros... | Hacker News

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		schrodinger on May 12, 2015 \| parent \| context \| favorite \| on: Learn SQL Interactively on Khan Academy I've used intersections and unions with sql. And also Cartesian products (a cross join). Don't those count?

peteretep on May 12, 2015 [–]

No, because in both cases the inputs and outputs are lists, not sets.

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