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Transactional partially-ordered message queuing

The key to those points is about the fact that Service Broker can deliver messages in the exact order of sending, and the fact that a message is consumed by a special pseudo SQL command call RECEIVE ...
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Is there a set theoretic way to look at SQL?

You say "A table could be defined as any subset of the Cartesian product." NO! A better statement would be : A relation can be defined as any subset of the Cartesian product. A table is not ...
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