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How To Hire SQL Developers?

In both its standard form and in meeting vendor-specific requirements, SQL has progressed significantly. In newer versions of SQL, features such as common table expressions (CTE) and window functions have been included, making it easier for developers to run sophisticated reports. ETL, BI, and reporting all benefit from a thorough understanding of these characteristics. As a result, when hiring a developer, it's a good idea to see how experienced they are with these features, rather than merely knowing the fundamentals of SQL-92 features.

Because of its syntax, most developers consider SQL to be outdated technology. However, while the syntax may appear "arcane" to coders, there isn't much to it in terms of functionality. Recruiters must assess candidates' attitudes about technology and their willingness to work with it while conducting interviews. Furthermore, they must differentiate between those who hide SQL behind an ORM and those who understand that an ORM can only handle a piece of a query, not the complete query.

Why Do You Need To Hire a SQL Developer?

Employers are looking for someone familiar with SQL. They are now looking for SQL-skilled developers. Because so much of our industry is now digital, and digital means data; data means database, and an employee must know SQL to access that database.

Data is now an important part of every decision-making process. As SQL has evolved into the universal interface for data analysis, so has the demand for SQL-savvy developers. According to Tableplus's data, there are over 1.4 million developer positions available, with roughly 1 million of them recruiting SQL developers or requiring SQL as a prerequisite ability.

We now live in a time when data is the most precious resource. Data is used by all businesses, no matter what industry they are in. They must organize the data in a straightforward, orderly, and relevant manner. Database professionals or SQL developers may be required to manage the data.

Skills Required For a SQL Developer:

1. Knowledge of databases

To land a top SQL database developer job, specialization is often required. Oracle is the most common database environment in the world, owing to its ability to handle larger data structures.

The open-source MySQL is widely used in web development, whereas Microsoft SQL Server is preferred by many other enterprises. Rather than dabbling in numerous database environments, focus on becoming an expert in one.

You'll require expertise working with production databases as a SQL developer. You should be able to do the following:

  • Create efficient database structures.

  • For integration with other applications, write optimal queries, views, and triggers.

  • Maintain high data quality and integrity requirements.

  • Learn about network performance and security challenges.

  • An SQL developer should also be knowledgeable in the following areas: Microsoft SQL Server, for example, is a reporting and business intelligence tool.

  • MongoDB and CouchDB are examples of NoSQL database systems.

  • Hadoop and Spark are examples of big data technology.

  • Amazon AWS and Microsoft Azure are two examples of cloud services.

  • Scrum and Agile methodologies, as well as the Software Development Life Cycle (SDLC).

  • Certification might help you to strengthen your expertise.

2. Programming knowledge

If you've never dealt with SQL before, you'll see that it's a pretty simple declarative language in which you write queries to edit or retrieve records from a database.

Professional SQL developers should ideally have prior experience in a development environment such as Oracle SQL Developer. Other programming needs differ from one organization to the next. For example, you might be supporting Java, C++, or C# applications, thus knowing these languages will help you communicate with other teams. Working with MySQL nearly always necessitates some knowledge of PHP. Working knowledge of the dot net framework is also advantageous, especially if you plan to specialize in Microsoft SQL Server.

3.PHP expertise

One of the most widely used scripting languages for website building is PHP. While it has nothing to do with increasing your SQL skills, it is still a useful skill to have because it can help you comprehend a website in general. Programmers frequently use PHP to create websites and SQL to interact with and request data from those websites. Understanding both of these languages allows a coder to completely comprehend how a website and its data function and interact.

4. Database

The database is a well-organized collection of information. Databases help with information storage and control. Databases make it simple to manage information. An online phone catalog, for example, would use a database to contain information about individuals, phone numbers, and other contact details. Every firm, service provider, and organization in your area uses a database to keep track of bills, customer complaints, and error information, among other things. We should also think about Facebook. It must save, govern, and offer data about individuals, their companions, part exercises, messages, promotions, and a variety of other items. Similarly, there are an endless number of cases of the same.

It is used to monitor the database's overall performance and to prescribe and initiate measures to improve/enhance performance, as well as to perform Snapshot Replication for the development and testing databases across several servers. It's used to create records and perspectives, as well as to save approaches for improving database/application performance.


(SQL Server Integration Service) is a component of Microsoft SQL Server database programming that may be used to perform a variety of data migration tasks. SSIS is a flexible and rapid data warehousing tool that may be used for data extraction, stacking, and changes such as cleaning, aggregating, and combining data. It makes it straightforward to transfer data from one database to the next. SSIS can extract data from a variety of sources, including SQL Server databases, Excel spreadsheets, Oracle and DB2 databases, and so on. SSIS also includes graphical tools and wizards for conducting work process functions such as sending email, FTP activities, data sources, and destinations.

6. T-SQL

T-SQL (Transact-SQL) is a set of programming extensions from Sybase and Microsoft that add transaction control, exception and error handling, row processing, and declared variables to the Structured Query Language (SQL). T-SQL proclamations are sent to the server by all programs that interface with SQL Server. The SELECT articulation, identifying output columns, restricting rows, and altering search criteria are all examples of T-SQL questions. In the meantime, T-SQL IDs are used in all SQL Server databases, servers, and database protests. The accompanying tables, imperatives, put away approaches, viewpoints, segments, and information categories are all examples of this. T-SQL identifiers should have unique names, be assigned when an item is created, and be used to distinguish an item.

SQL Developer Salaries:

SQL Developer Salary

According to greatlearning the SQL Developer salary for freshers and experienced is given above:

The average annual wage is 69,000 dollars. The compensation range is also determined by your level of experience and the sort of company you work for. The salary for a junior or entry-level SQL developer might be as high as $50,000 per year.

You can earn around $74,000 as a mid-level SQL developer. It can cost up to $1,33,000 for a senior-level SQL developer.

The average hourly wage for a freelancer is $90. In comparison to mid-level SQL developers, an experienced freelancer can earn more per hour.

Top Interview Questions To Hire SQL Developers:

  1. What is the difference between SQL and MySQL?

  2. What are the different subsets of SQL?

  3. What do you mean by DBMS? What are its different types?

  4. What do you mean by table and field in SQL?

  5. What are joins in SQL?

  6. What is the difference between CHAR and VARCHAR2 datatype in SQL?

  7. What is the Primary key?

  8. What are Constraints?

  9. What is the difference between DELETE and TRUNCATE statements?

  10. What is a Unique key?

Access the SQL Interview question resource for the answers to the above questions.

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