Adding a 'Mobile Number' Column to a Student Table in SQL

Jack, a Database Developer, has already created a student table containing the following columns: 'Student_id', 'student Name', and 'Student class'. Now he wants to add a new column to the student table called 'Mobile Number'. Help him identify the correct SQL statement for this task.

Options:

A: alter table student add column(mobile_no) B: alter table student add column mobile no int(20) C: alter table add column(mobile_no) D: None of these

Correct Answer:

B: alter table student add column mobile no int(20)

Explanation:

The correct SQL statement to add a new column 'Mobile Number' with an integer data type to the 'student' table is:

alter table student add column mobile_no int(20);

This statement uses the ALTER TABLE command to modify the existing table structure. The ADD COLUMN clause specifies the new column name (mobile_no) and its data type (int(20)). The int(20) data type defines an integer column with a maximum length of 20 digits. The parentheses in the column name are not required and are considered best practice to avoid confusion.

Important Note: The specific data type used for the 'Mobile Number' column may vary depending on the database system and specific requirements. For example, a VARCHAR data type could be used to store mobile numbers as text strings.