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2.6 Consider the following expressions, which use the result of a relational algebra operation as the input to another operation. For each expression, explain in

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2.6 Consider the following expressions, which use the result of a relational algebra operation as the input to another operation. For each expression, explain in words what the expression does. a b. c. o,ea"22009(takes) D4 student o,ear 2009(takes student) 1D,name, course-id(student M takes)

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