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(a) (15 points) Consider the relational database of Employee. Give an expression in the relational algebra to express each of the following queries: i Find

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(a) (15 points) Consider the relational database of Employee. Give an expression in the relational algebra to express each of the following queries: i Find the names of all employees who live in city "Miami" li. Find the names of all employees whose salary is greater than $100,000. ili. Find the names of all employees who live in "Miami" and whose salary is greater than $100,000. (b) (3+3+4 of a relational algebra operation as the input to another operation. For each expression, explain in words what the expression does, Assu schemas or relations i.e. student and takes (means student takes courses) 10 points) Consider the following expressions, which use the result me there are two i. yearz 2009 (takes) student l. year2 2009 (takes, student) iii. 1D, name, course-id (student takes)

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