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New Domain Tuesday: HackerRank Reveals Data Structure, Database & SQL Challenges!

This is the 2nd of a series of never-before-seen challenges written to help you become a better programmer. Check back next Tuesday for shiny, new CS Domains! This is part 2 of 3. In case you missed it, here’s part 1 & part 3

Ready to brush up on your data skills? Today, we’re excited to announce 3 new domains to help you become a master data wrangler! You’ll find brand new challenges today in data structure, database and SQL domains. Today marks our initial release, but our dedicated challenge content team will continuously add new challenges over the next few weeks.

Learning how to organize data, manage databases and write in SQL are essential skills for programmers and data scientists alike. The demand for professionals who can accurately and efficiently manage and manipulate massive data sets has been skyrocketing worldwide. For instance, between 2013 and 2014, the Demand for Computer Systems Analysts with big data expertise increased 89.9%. The spike in these skills correlates with the relatively recent spike in demand for data scientists in general.
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The information age has invited more opportunities for businesses to track every single step of the consumer to help predict new demands, habits and project behavior, spawning the era of Big Data. Developers will frequently run into data sets and knowing key skills, like data structures, databases and SQL, can help you become a better programmer. Businesses depend on their tech teams to help extract valuable insights from massive datasets.

Why Master Data Structures?

Some of the biggest tech companies require you to be well-versed in data structures during job interviews. It’s essential for programmers to be able to manipulate complex data structures. The better structured the data, the faster your software will run.

Leveraging HackerRank’s new Data Structure challenges will give you a leg up on your competition! For instance, one common interview question might be: Write code to print all paths of a binary tree from the root. HackerRank’s new Data Structure domain covers such basic data structures as binary trees and linked lists, and we plan on adding more types of data structures in the near future.

Why Master Databases?

Developers often work with databases in the real world because the world runs on databases in the information age. Just about everything, from your search query to your request for an Uber, hits a database of some kind.
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Source: CSC

There are several different forms of databases you should know, like traditional SQL tables, NoSQL style databases, text files and files maintained on Hadoop MapReduced systems. You can now learn and practice several database aspects directly on HackerRank!

Unlike the rest of our domains that focus on general coding, algorithms and programming competitions, our database challenges are more theoretical and fundamental in nature and touch upon many of the technology-agnostic principles of the domain – such as sets, relations, relational algebra and relational calculus.

After diving into HackerRank’s new Database Domain, you’ll become a master at several tech-agnostic features, like sets, relations, relational algebra and relational calculus.

Why Master SQL?

As you can see from the graph based on WANTED analytics, the demand for Structured Query Language (SQL) skills in the job market is steadily increasing because it’s the main language for databases. Relevant for nearly all tech jobs, it’s particularly useful for web developers, computer systems analysts and app software engineers.

In reality, nearly all professionals can leverage SQL to help you become a power user in many widely used tools, like Google Spreadsheet or Excel. SQL can help you develop queries on any types of data.

On HackerRank’s new SQL Domain, you’ll start off with simple queries, like creating and deleting tables. Then, you’ll move on to advanced topics, like locks, views, transactions and stored procedures.

Alright, let’s see how well you do in the brand new HackerRank domains!

NEXT: Read Part 3 of New Domain Tuesday here.

Comments (6)

  • really helpful 🙂

    • aditya
    • May 19, 2015 at 7:39 pm
    • Reply
  • Great to see SQL challenges….. 🙂

    • Gaurav Goel
    • May 20, 2015 at 11:58 am
    • Reply
  • I like these changes a lot, thank you! For the multiple choice questions in the database domain, it would be nice if you linked to some suggested reading.

    • programmer567
    • May 26, 2015 at 7:21 am
    • Reply
  • This is great. Just a suggestion. I am seriously looking forward to more problem sets in the SQL category.

    • Himanshu Jain
    • May 27, 2015 at 4:35 am
    • Reply

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