> some nuances of GROUP BY I won't call them nuances. SQL tries hard to be very close to set theory, and not just for the sake of it. In set theory, you have n

> some nuances of GROUP BY I won't call them nuances. SQL tries hard to be very close to set theory, and not just for the sake of it. In set theory, you have no nuances, you have only one possible answer to a question, and MySQL is like a bad student how do not understand why, in maths, you should never affirm something that is not 100% sure and proven.