SQL Interview Question 面试的时候发现会问一些SQL的基本问题,在此总结一下。 ProgramInterview/SQL这个网站上的问题还比较全。 1. Join type INNER JOIN: Returns all rows when there is at least one match in BOTH tables LEFT JOIN: Return all rows from the left table, and the matched rows from the...
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To get this, you need to use data from both available tables, and you need JOINs. In this case, it’s INNER JOIN because you’re interested only in tracks from both tables. Join the tables on the track name and date. The question asks you to output only tracks that were ranked first...
Solution of SQL Interview Question #3 Solution: SELECT department_name, AVG(salaries.salary) AS avg_salaries FROM employees JOIN salaries ON employees.employee_id = salaries.employee_id GROUP BY department_name HAVING AVG(salaries.salary) < 500; Note: You can solve this task using a subquery...
FROM Employees WHERE Name LIKE 'A%'; This query retrieves all employees whose names start with ‘A’. Intermediate SQL interview questions with detailed answers: 11. Find Customer Order Counts Question: Write a query to list customers who have placed more than 5 orders. Use the customers and...
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A candidate who needs some help along the way but communicates clearly can be even better than a candidate who breezes through the question. Understand what kind of problem it is. There are two types of problems: Coding. The interviewer wants to see you write clean, efficient code for a...
Standard rotated binary search question. You have a sorted array that has been shifted/cycled, perform a search on it Retrieve words from a dictionary that are made up of a subsequence of characters in an input string (i.e. given input “ABAT,” matching words may include “BAT” and “...
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To learn more about API design, check out this mock interview from Exponent, on designing the Twitter API: 8. How would you design a messaging app? Real-time messaging apps are a common standalone product, or a built-in feature of larger systems. For this question, you might be asked ...