Question

The join operation

A) combines relational tables to provide the user with more information than is otherwise available.
B) identifies the table from which the columns will be selected.
C) creates a subset consisting of columns in a table.
D) organizes elements into segments.

Answer 1

The join operation combines relational tables to provide the user with more information than is otherwise available.

Step-by-step explanation:

The join operation is a fundamental concept in relational databases. It is used to combine two or more tables based on a related column or columns. The purpose of the join operation is to provide the user with more information than is otherwise available by combining data from different tables.

For example, consider two tables: 'Students' and 'Grades'. The 'Students' table may have information about student names, IDs, and majors, while the 'Grades' table may have information about student IDs, course IDs, and grades. By performing a join operation on the 'Student ID' column, we can retrieve a result set that includes both the student information and their corresponding grades.