All of the following are true regarding a join operation in an SQL SELECT command, except ____.
A) it requires at least two tables to be specified in the FROM clause
B) it can involve the specification of more than two tables in the FROM clause
C) it requires corresponding join attributes to be set equal to each other in the WHERE clause
D) it can also involve relational Select and Project operations in the same SQL SELECT command
E) there will be at least two tables in the query output because at least two tables were involved in the join

Question

Quizplus · Accepted Answer

A join operation combines rows from two or more tables based on a related column between them. The result of a join operation is a single table that merges the columns and rows from the joined tables, not multiple tables. Therefore, the statement that there will be at least two tables in the query output is incorrect.

All of the Following Are True Regarding a Join Operation