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 _______________ _______________ 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 ____________________](/uploads/image/z/7107726-30-6.jpg?t=%E6%95%B0%E6%8D%AE%E5%BA%93%E5%85%B3%E7%B3%BB%E4%BB%A3%E6%95%B0%E4%BA%A4%E8%BF%90%E7%AE%97%E8%B0%A2%E8%B0%A2%E4%BA%86%2C%E5%85%B3%E7%B3%BBR%E3%80%81S%E5%88%86%E5%88%AB%E4%B8%BA%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%B1%82+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 ____________________
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?
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