How did SQL standardization improve interoperability between relational database management systems (RDBMSs)?

Which type of attribute cannot be divided further?

What will happen if the following SQL command is executed, if the age column has a CHECK constraint enforcing positive values? INSERT INTO Users (username, age, country_code) VALUES (‘alice756’, -1 , ‘US’);

Which SQL command will retrieve all users whose age is greater than 25 and who belong to the ‘US’?

An entity can participate in multiple relationships in an ER diagram.

Which of the following is an advantage of MySQL being open-source?

Why is the DECIMAL data type recommended for storing money or prices in SQL?

What is referential integrity in a relational database?

Which of the following operations can violate referential integrity?

What is the role of NULL values in relational databases?