Defined the relational algebra operations as follows:SELECT (p, R) is equivalent to σp(R) referring to a set tuples of relation R that conforms to predicate p. PROJECT(L, R) is equivalent to πL(R) referring to a relation that contains a vertical subset of R, extracting the values of specified attributes L and eliminating duplicates.JOIN (R, p, S) refers to a relation containing a combination of tuples of relations R and S that satisfy the join condition p.FULL_JOIN (R, p, S) refers to a relation containing the result of outer join between relations R and S that satisfy the join condition pLEFT_JOIN (R, p, S) refers to a relation containing the result of left outer join between relations R and S that satisfy the join condition pRIGHT_JOIN (R, p, S) refers to a relation containing the result of right outer join between relations R and S that satisfy the join condition pCROSS (R, S) refers to a relation containing the catesian product of relations R and S. UNION (R, S) refers to a relation containing the union of relations R and S. INTERSECTION (R, S) refers to a relation containing the intersection of relations R and S. DIFFERENCE (R, S) refers to a relation containing the set difference between relations R and S. AGGREGATE (R, f) refers to a relation derived from relation R with a list of function-attribute pairs, where function is one of the allowed aggregaton functions such as COUNT, SUM, AVERAGE, MAXIMUM and MINIMUM, and attribute is an attribute of R.AGGREGATE (R, f, g) refers to a relation derived from relation R with a grouping of tuples with respect to a list of attributes of R specified in g and a list of function-attribute pairs, where function is one of the allowed aggregaton functions such as COUNT, SUM, AVERAGE, MAXIMUM and MINIMUM, and attribute is an attribute of R. Write a relational algebra expression that is equivalent to the following SQL statement:SELECT AVG(SALARY) , COUNT(*)FROM EMPLOYEEWHERE GENDER = 'M'GROUP BY DEPT_CODE

Given SQL statement is, SELECT AVG(SALARY) , COUNT(*) FROM EMPLOYEE WHERE GENDER = 'M' GROUP BY…

Answered: Write a relational algebra expression…

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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Defined the relational algebra operations as follows:

SELECT (p, R) is equivalent to σ_p(R) referring to a set tuples of relation R that conforms to predicate p.
PROJECT(L, R) is equivalent to π_L(R) referring to a relation that contains a vertical subset of R, extracting the values of specified attributes L and eliminating duplicates.
JOIN (R, p, S) refers to a relation containing a combination of tuples of relations R and S that satisfy the join condition p.
FULL_JOIN (R, p, S) refers to a relation containing the result of outer join between relations R and S that satisfy the join condition p
LEFT_JOIN (R, p, S) refers to a relation containing the result of left outer join between relations R and S that satisfy the join condition p
RIGHT_JOIN (R, p, S) refers to a relation containing the result of right outer join between relations R and S that satisfy the join condition p
CROSS (R, S) refers to a relation containing the catesian product of relations R and S.
UNION (R, S) refers to a relation containing the union of relations R and S.
INTERSECTION (R, S) refers to a relation containing the intersection of relations R and S.
DIFFERENCE (R, S) refers to a relation containing the set difference between relations R and S.
AGGREGATE (R, f) refers to a relation derived from relation R with a list of function-attribute pairs, where function is one of the allowed aggregaton functions such as COUNT, SUM, AVERAGE, MAXIMUM and MINIMUM, and attribute is an attribute of R.
AGGREGATE (R, f, g) refers to a relation derived from relation R with a grouping of tuples with respect to a list of attributes of R specified in g and a list of function-attribute pairs, where function is one of the allowed aggregaton functions such as COUNT, SUM, AVERAGE, MAXIMUM and MINIMUM, and attribute is an attribute of R.