http://vadimtropashko.wordpress.com with occasional pedestrian SQL topics Sun, 01 Nov 2009 17:24:11 +0000 http://wordpress.com/ hourly 1 http://vadimtropashko.wordpress.com/why-relational-division-is-so-uncommon/#comment-1122 Vadim Tropashko Sun, 01 Nov 2009 17:24:11 +0000 http://vadimtropashko.wordpress.com/why-relational-division-is-so-uncommon/#comment-1122 I changed "set" into a "family". Union of family of sets is generalization of the union of the two sets. P.S. I'm not sure if this section really belongs here; perhaps it should better be moved into other article... I changed “set” into a “family”. Union of family of sets is generalization of the union of the two sets.
P.S. I’m not sure if this section really belongs here; perhaps it should better be moved into other article…

]]> http://vadimtropashko.wordpress.com/why-relational-division-is-so-uncommon/#comment-1121 paul c Sun, 01 Nov 2009 02:18:41 +0000 http://vadimtropashko.wordpress.com/why-relational-division-is-so-uncommon/#comment-1121 In "Given a set of sets, e.g {{1,3,5},{3,4,5},{5,6}} find their union", don't you mean find the union of their elements? In “Given a set of sets, e.g {{1,3,5},{3,4,5},{5,6}} find their union”, don’t you mean find the union of their elements?

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