Which of the following is true regarding relational algebra? A.SQL statements ar

Question

Which of the following is true regarding relational algebra? A.SQL statements are parsed by MySQL into relational algebra expressions B. Projection is a binary operation C. A JOIN statement would never be parsed into Cartesian Product operator D. The projection operator is most similar to the WHERE clause in SQL E. The Greek symbol theta in relational algebra performs a similar function to the ORDER BY clause in SQL Which of the following is true regarding joins? OA. A thetajoin allows the use of various comparators, such as >, and 2 in the predicate B. An equijoin only allows the use of the comparator- in the predicate C. A natural join is an equijoin where one occurrence of each common attribute is eliminated in the resulting relation D.The result of a left outer join may have cells with a NULL value E. All of the above

Explanation / Answer

!)

OPTION A IS TRUE

Because

A) sql statements are parsed by dbms and mysql in to relational algebra that can translated ra-expression

B) Projection is not a binary operation it produces the relations R contains of only some r expressions

C) Join statement is used to get the cartesian product so it can parsed by its operator

D) Selection is similar to where clause not projection

E)Greek symbol theta is the natural join prescribed in relational algebra

2)

Option E

Because as refered to joins the statements which are mentioned are true

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