Explanation:RIGHT OUTER JOIN: Return all rows from the right table, and the matched rows from the left table. 9. The operation which is not considered a basic operation of relational algebra is
A. Join
B. Selection
C. Union
D. Cross product
Answer:A
Explanation:RIGHT OUTER JOIN: Return all rows from the right table, and the matched rows from the left table. 9. The operation which is not considered a basic operation of relational algebra is
A. Join B. Selection C. Union D. Cross product
Explanation:None. 10. In SQL the statement select * from R, S is equivalent to