Sql Scenario Based Questions
Challenging SQL Scenarios for Problem Solving
Sql Scenario Based Questions
SQL scenario-based questions are commonly used in interviews to evaluate a candidate's ability to apply SQL concepts and solve real-world problems. These questions present a scenario or problem that needs to be solved using SQL queries, requiring candidates to demonstrate their knowledge of database design, querying, manipulation, normalization, and optimization. Candidates may be asked to write complex SQL queries, perform data analysis, extract specific information from databases, or optimize existing queries for better performance. Success in answering SQL scenario-based questions often requires a strong understanding of SQL fundamentals, problem-solving skills, and the ability to think critically about data structures and relationships. It is important to practice solving a variety of SQL scenarios to prepare for interviews and showcase proficiency in using SQL to work with databases effectively.
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1 - In a database table storing employee information, how would you find the employee with the highest salary?
To find the employee with the highest salary in the table, you can use the following SQL query: SELECT * FROM employees ORDER BY salary DESC LIMIT 1. This query will sort the entries in the table by salary in descending order and then limit the result to only the first row, which will be the employee with the highest salary.
2) How would you retrieve the names of employees who have been with the company for more than 5 years?
To retrieve the names of employees who have been with the company for more than 5 years, you can use the following SQL query: SELECT name FROM employees WHERE join_date < DATE_SUB(NOW(), INTERVAL 5 YEAR). This query will select the names of employees from the table where the join date is more than 5 years before the current date.
3) How can you calculate the total sales amount for each product category from a sales table?
To calculate the total sales amount for each product category from a sales table, you can use the following SQL query: SELECT product_category, SUM(sales_amount) FROM sales_table GROUP BY product_category. This query will group the sales data by product category and then calculate the total sales amount for each category using the SUM function.
4) Given a table that stores customer orders, how would you find the average order value?
To find the average order value from a table storing customer orders, you can use the following SQL query: SELECT AVG(order_value) FROM customer_orders. This query will calculate the average order value by taking the average of all the order values stored in the table.
5) How can you identify duplicate records in a table?
To identify duplicate records in a table, you can use the following SQL query: SELECT column1, column2, COUNT(*) FROM table_name GROUP BY column1, column2 HAVING COUNT(*) > 1. This query will group the records based on the columns you specify and then only show the groups that have more than one entry, indicating duplicate records.
6) How would you update the email address of a specific customer in a customers table?
To update the email address of a specific customer in a customers table, you can use the following SQL query: UPDATE customers SET email = ‘new_email@example.com’ WHERE customer_id = ‘specific_id’. This query will update the email address for the customer with the specified customer ID to the new email address provided.
7) Given a database table storing product inventory, how can you retrieve the products that are out of stock?
To retrieve the products that are out of stock from a product inventory table, you can use the following SQL query: SELECT * FROM products WHERE stock_quantity = 0. This query will select all the products from the table where the stock quantity is equal to zero, indicating that the products are out of stock.
8) How can you find the top 3 highest paid employees in a company?
To find the top 3 highest paid employees in a company, you can use the following SQL query: SELECT * FROM employees ORDER BY salary DESC LIMIT 3. This query will sort the employees by salary in descending order and then limit the result to only the top 3 highest paid employees.
9) How would you retrieve the average age of employees in the company?
To retrieve the average age of employees in the company, you can use the following SQL query: SELECT AVG(DATEDIFF(NOW(), birth_date) / 365) FROM employees. This query will calculate the average age of employees by subtracting the birth date from the current date, dividing by the number of days in a year, and then taking the average.
10) Given a table storing student exam scores, how can you calculate the total number of students who passed the exam?
To calculate the total number of students who passed the exam from a table storing student exam scores, you can use the following SQL query: SELECT COUNT(*) FROM exam_scores WHERE score ≥ passing_score. This query will count the number of entries in the table where the score is equal to or greater than the passing score, giving you the total number of students who passed the exam.
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