MYSQL DATABASE INTERVIEW QUESTIONS

What does NULL mean in MySQL?

What is the purpose of the NOT NULL constraint in MySQL?

How do you check for NULL values in a query?

How do you insert a NULL value into a column?

What is the difference between NULL and an empty string in MySQL?

How can you modify an existing column to enforce the NOT NULL constraint?

How does MySQL handle comparisons involving NULL values?

How can you handle NULL values in aggregate functions?

How do you use the COALESCE function to handle NULL values?

Describe a scenario where handling NULL values correctly is crucial and how to implement it in MySQL.