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--> Let a, b be a set of attributes, a( Q b (R)) = Q b (a(R)). Give an example where this is true, and
--> Let a, b be a set of attributes, a( Q b (R)) = Q b (a(R)). Give an example where this is true, and an example where this is false.
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Understanding Our Universe ()
Authors: Stacy Palen, Laura Kay, George Blumenthal
3rd Edition
0393631761, 9780393631760
