Question

The JOIN which returns all the records from the right table in conjunction with the matching records from the left table and if there are no matching values in the left table, it returns NULL. Which is this JOIN?

A) Right Outer JOIN
B) CROSS JOIN
C) Left Outer Join
D) Full Outjoin JOIN

Answer 1

The JOIN operation that returns all records from the right table and matching records from the left table, or NULL for no match on the left, is the Right Outer JOIN.

Step-by-step explanation:

The JOIN operation in question that returns all the records from the right table and the matching records from the left table, while filling in with NULL for non-matching rows from the left table, is called a Right Outer JOIN. When a Right Outer JOIN is performed, the result set includes all the rows from the right table. If there is a row in the right table but no matching row in the left table, the result set will include that row with NULL values for columns from the left table.

In contrast, a Left Outer JOIN does the opposite by returning all records from the left table and matching rows from the right table, filling with NULL when there is no match on the right. CROSS JOIN provides a Cartesian product of both tables, including all possible combinations of rows, regardless of matches. Lastly, a Full Outer JOIN returns all records from both the left and right tables, with NULL in place for non-matching rows from either side. The correct answer to the question is A) Right Outer JOIN.