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SQL Fundamentals Quiz

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Questions and Answers

Which command is used to create a new table named 'students' with columns for student_id, name, and enrollment_date?

INSERT INTO students (student_id, name, enrollment_date) VALUES (1, 'John Doe', '2023-01-01');

MAKE TABLE students (student_id INT, name VARCHAR(100), enrollment_date DATE);

CREATE TABLE students (student_id INT, name VARCHAR(100), enrollment_date DATE); (correct)

ADD TABLE students (student_id INT, name VARCHAR(100), enrollment_date DATE);

What command should you use to modify the 'orders' table by adding a column called 'order_status'?

CHANGE TABLE orders ADD order_status VARCHAR(20);

UPDATE orders SET order_status = 'pending';

ALTER TABLE orders ADD COLUMN order_status VARCHAR(20); (correct)

MODIFY TABLE orders ADD order_status VARCHAR(20);

What command should you execute to remove a record from the 'inventory' table where the product_id is 10?

CLEAR inventory WHERE product_id = 10;

REMOVE FROM inventory WHERE product_id = 10;

DROP FROM inventory WHERE product_id = 10;

DELETE FROM inventory WHERE product_id = 10; (correct)

Which command would you use to grant a user named 'manager' permission to update records in the 'sales' table?

GRANT UPDATE ON sales TO 'manager'; Signup and view all the answers

Which SQL command will you use to select all records from the 'employees' table where the hire_date is after January 1, 2020?

SELECT * FROM employees WHERE hire_date > '2020-01-01'; Signup and view all the answers

What command should you use to drop the 'departments' table from the database?

DROP TABLE departments; Signup and view all the answers

What is the appropriate command to update the email field of a user in the 'users' table where the user_id is 3?

UPDATE users SET email = '<a href="mailto:[email protected]">[email protected]</a>' WHERE user_id = 3; Signup and view all the answers

Which command would you choose to revoke SELECT permission from a user named 'guest' on the 'products' table?

REVOKE SELECT ON products FROM 'guest'; Signup and view all the answers

Study Notes

Creating Tables

CREATE TABLE students (student_id INT, name VARCHAR(255), enrollment_date DATE); creates a table named students with columns for student ID (integer), name (string), and enrollment date.

Modifying Tables

ALTER TABLE orders ADD COLUMN order_status VARCHAR(255); adds an order_status column (string) to the orders table.

Deleting Records

DELETE FROM inventory WHERE product_id = 10; removes the record with product_id 10 from the inventory table.

Granting Permissions

GRANT UPDATE ON sales TO manager; grants the user manager permission to update the sales table.

Selecting Records with Conditions

SELECT * FROM employees WHERE hire_date > '2020-01-01'; selects all records from employees where the hire_date is after January 1, 2020.

Dropping Tables

DROP TABLE departments; removes the departments table from the database.

Updating Records

UPDATE users SET email = '[email protected]' WHERE user_id = 3; updates the email address for the user with user_id 3 in the users table.

Revoking Permissions

REVOKE SELECT ON products FROM guest; removes SELECT permission from the user guest on the products table.

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Description

Test your knowledge of SQL commands, including creating tables, modifying structures, deleting records, and managing permissions. This quiz covers essential SQL operations and conditions necessary for database management.