Hiring DEV Talent: SQL Interview Questions
A version of this article has been published on The HackerEarth Blog.
With SQL taking its place among the most popular developing languages for the management of data, as per this 2021 report by Statista, SQL is pretty much the most popular language, and hiring developers for the same is a smart move to make. This is why it is quite important for companies to take interest in it and to further make use of it
Organizations can use this language for data analysis, management, and much more. This is precisely why you want to find the right SQL coding developer for your organization.
Technical recruitment can be quite challenging but there are things you can do apart from just asking the same old questions for an effective interview process. Hiring a developer needn’t be difficult at all, want to know how? Keep on reading :)
How Technical Recruiters Can Step Up Their Game
Given how the landscape of technical recruitment looks right now, especially post-pandemic, it is imperative that recruiters level up their game.
Asking the same old SQL interview questions will not work as great as before, as a recruiter apart from looking for developers, you must also look for ways to render your recruitment game much more efficient. From learning new skills to being more inclusive in your approach, there are a ton of things you can do to keep pace with the ever-growing world of tech recruitment.
Set Clear Expectations
Setting clear expectations is something that should be among the top priorities in your recruitment process.
You can only assess the candidate thoroughly when the candidate understands what is expected of him/her. During the very first interview process, setting clear objectives is important. This also means that you will be offering your candidates a realistic preview of the job.
When you talk about objectives and expectations, you should get the candidate excited about the role. With clear objectives in mind, it will be easier for the candidate to understand what they must do to secure their position and they will also know what to expect from the job as well.
Use Real-World Problems
Hiring a skilled developer sounds good but know that just developing skills aren’t enough. Having adept problem-solving skills can go a long way, it can also improve their developing skills. Problem-solving is an indicator of a great employee.
To assess their problem-solving skills, you ought to use real-world problems. Using real-world scenarios will also give you a good idea about their skills, being able to solve real-world problems also showcases:
- Creative thinking
- Analytical thinking
So by bringing this method to the table, you are not only hiring developers who know the language, but you are also hiring someone who will take initiative and try to bring out the best in themselves.
Look Beyond Technical Skills
As a follow-up to the point above, looking beyond technical skills and problem-solving skills definitely pays off.
It doesn’t matter how good the candidate is unless he is the right fit for the organization. You need to look for open-minded individuals who can be great team players as well. You need people who will stick around for a long period of time, someone who is befitting to the work environment the organization has to offer.
There are several platforms for hiring developers that take the process of screening and interviewing to a whole new level.
Gone are the days where you had to take an interview and ask the candidate to write a code on paper. With interview and screening tools, you can request the candidate to work on a code right then and there, after which you can use assessment tools to give your candidate feedback immediately.
Online Tech Forums and Communities
Online Tech Forums and Communities is one of the best places to find developers. This concept is relatively new, but engaging with developers and coders through these forums will give you several options, and also this is a way of sourcing candidates even before a job vacancy pops up.
Sample SQL Interview Questions
Here are a few sample questions you can refer to:
- List out the standard SQL commands.
- Explain the different subsets of SQL
- Explain what Relational Database Management Is
- List out the differences between outer join and inner join
- How does data normalization work and what is its purpose?
- What Is Union?
- What is a UNIQUE constraint? Explain.
- How do you copy one table to another?
- How do you insert a row for identity column implicity?
- Explain the difference between multiple-row functions and single-row functions
- What would be the output of the below-mentioned query of an employee table with 10 records?
- What is an execution plan? How do you view it and use it?
- Given below is a customer table with data for which you must write one SQL statement link and sequence customer names in the following single semicolon-separated string
Sebastian V; Akshay Varma; Manoj Kumar; Shrishti Singh; Abhay
- Explain the difference between varchar2 and char?
- What is the NVL function in SQL? How is it different from NVL2?
- Give the SQL statement for the below
- In the below mentioned table
Write a query to list out people who attended class more than once in a single day. Let the order start from the most recent and group it by the user and lesson attended.
These are some of the questions you can ask when you’re in the process of interviewing and a hiring developer, but remember that a well-planned recruitment strategy always pays off in a great manner.
Moreover, technology has the answer for all the above, there are multiple tools available through which you can elevate your recruitment strategy. Like HackerEarth’s live interview tool which allows real-time code editing, similarly, there are other tools.
So don’t wait too long to make your recruitment game strong.