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Sql Interview Questions

12 real Sql questions asked in live technical interviews — each with a model answer. Updated weekly.

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How would you restrict the MCP to only allow predefined safe SQL operations?🟡 Medium · Conceptual · Asked 1×Would you allow your MCP to execute arbitrary SQL against a connected SQL database?🟡 Medium · Conceptual · Asked 1×How would you write a SQL query to find the first and last purchase dates for each customer-product pair, ensuring that each pair has at least two completed orders?🟡 Medium · Coding · Asked 1×Write a SQL query that returns the first and last purchase dates for each customer-product pair, only including pairs with at least two completed orders.🟡 Medium · Coding · Asked 1×Describe how you would use a CTE and window functions to rank purchases by date and then filter for the first and last occurrences for each customer-product pair.🟡 Medium · Coding · Asked 1×Explain why you should use 'IS NOT NULL' instead of 'ISNULL' in SQL queries.🟢 Easy · Conceptual · Asked 1×Why do we use a calendar function?🟢 Easy · Conceptual · Asked 1×Explain the following SQL query: SELECT customer_name, COUNT(*) FROM customerTable WHERE CITY_Name LIKE '%Pu%'?🟢 Easy · Conceptual · Asked 1×Why did you use ORDER BY in your experience query?🟡 Medium · Debugging · Asked 1×Why did you use PARTITION BY by industry?🟡 Medium · Behavioral · Asked 1×Write a SQL query to select the top 10 users by order count.🔴 Hard · Coding · Asked 1×What is the correct method to achieve the highest sales rank, dense rank, or row number?🟡 Medium · Conceptual · Asked 1×

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