One common and fundamental SQL question is: "What is the difference between INNER JOIN and LEFT JOIN in SQL, and when would you use each?" This question assesses your understanding of SQL JOIN operations. Here's a brief overview: INNER JOIN: Returns only the rows where there is a match in both tables based on the specified condition. If there is no match, the row from both tables is not included in the result set. LEFT JOIN (or LEFT OUTER JOIN): Returns all the rows from the left table and the matched rows from the right table. If there is no match, NULL values are returned for columns from the right table. Useful when you want to retrieve all records from the left table and related data from the right table, even if there is no match.

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