数据库关系代数交运算谢谢了,关系R、S分别为图所示,求 RS _______ _ R A B C S A B C ------------------------- ------------------------ a1 b1 c1 a1 b2 c2 a1 b2 c2 a1 b3 c2 a2 b2 c1 a2 b2 c1 ______________

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数据库关系代数交运算谢谢了,关系R、S分别为图所示,求RS______________________________RABCSABC---------------------------------

数据库关系代数交运算谢谢了,关系R、S分别为图所示,求 RS _______________ _______________ R A B C S A B C ------------------------- ------------------------ a1 b1 c1 a1 b2 c2 a1 b2 c2 a1 b3 c2 a2 b2 c1 a2 b2 c1 ____________________
数据库关系代数交运算谢谢了,
关系R、S分别为图所示,求 RS _______________ _______________ R A B C S A B C ------------------------- ------------------------ a1 b1 c1 a1 b2 c2 a1 b2 c2 a1 b3 c2 a2 b2 c1 a2 b2 c1 _________________________ ______________________ R∩S A B C ------------------------- a1 b2 c2 a2 b2 c1 ______________ 的解法对么?