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Structured Query Language – or SQL – is one of the most popular database languages in the world. It’s used to manipulate and, as the name suggests, query data found in relational databases. As data processing is becoming an essential process for almost every industry on the planet, SQL developers remain in high demand.
Companies have more ways to utilize data than ever, making SQL vital for non-technical and technical professionals alike. Via SQL databases, organizations can structure data in ways that help them learn more about their customers’ preferences, behaviors, and tastes across various platforms.
Furthermore, SQL is crucial for back-end development – it’s used to manage the databases on which most applications and servers are based. For brand-new developers, SQL is also handy because it’s effortless to learn – its syntax is almost as understandable as any human language.
Basically, any company with a website that functions by retrieving any kind of data from a back-end database probably uses SQL. Of course, many of those databases are proprietary and come with certain system-specific features and quirks. However, most of them still use SQL whenever they need storage for relational data.
That includes everyone from Facebook to music streaming services like Spotify, social media platforms like Instagram and Twitter, and even banking apps. Logging, e-commerce, and data warehousing – if we’re talking about any process that involves data on web servers, it probably uses SQL.
In practice, most companies won’t develop their own proprietary database management systems – there are already plenty of open-source options based on SQL, such as MySQL, Ingres, PostgreSQL, Firebird, etc.
The length of a project depends on many factors, including the scope of your project and the technical complexity of it. When you post a freelance SQL project request on Codementor, you’ll have the option to indicate when you’d expect the project to be completed. We suggest chatting with the interested developers to ensure both sides are on the same page. For more information on how to post a freelance SQL request on Codementor, check out our article.
We don’t charge anything when you post a freelance hiring request for SQL developers! You’ll have the chance to determine what the budget for your project is when you post the request. You’ll only need to pay the developer if you’re 100% satisfied with their work. Please know that Codementor charges a small service fee when a developer completes the job.
While the exact skills your ideal SQL coders need vary from project to project, there are some things that every decent SQL programmer should know. For instance, they need some basic knowledge of relational theory, as well as SQL design skills and performance tuning. The same applies to SQL refactoring skills, knowledge of NoSQL, and XSLT experience.
Relational theory and SQL design skills are vital for new projects that are just getting off the ground – if a database was mismanaged and poorly designed early on, migrating them will be problematic down the line. Once you’ve established a system, design skills become less important – though they’re still helpful.
Also, SQL refactoring knowledge is excellent for larger teams, where the SQL work can become quite complex. While Java refactoring is simpler nowadays, mainly because of IDE tooling, SQL code is still relatively difficult to test.
We do a comprehensive technical and communications screen of all SQL developers at Codementor. Our network includes book authors, popular open source contributors, top Stack Overflow users and engineers at top tech companies. In addition, to continually ensure the quality of our freelancers, we regularly check in on existing SQL developers’ user satisfaction rates.
If you’re hiring freelance SQL developers for your project, there are a couple of things you want to check during your interview. On the one hand, you want to see whether they have the technical expertise you need, and on the other, you need to learn whether they’re dedicated freelancers ready to commit to your project.
Here are a few interview questions you can use to that effect:
For more answers to frequently asked questions, see here.