Answer: Primary Keys uniquely identify a record; Foreign Keys link two tables together.
Returns all records from the left table and matched records from the right. download sql interview questions and answers pdf
Answer: A query within a query, used for filtering or calculating values that the outer query depends on. How to Prepare for the Technical Round Answer: Primary Keys uniquely identify a record; Foreign
Answer: Usually solved using a subquery or DENSE_RANK() . What is the difference between TRUNCATE and DELETE? download sql interview questions and answers pdf
Answer: UNION removes duplicate rows; UNION ALL keeps them and is generally faster.
