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SQL (Structured Query Language) is a database computer language designed for accessing and manipulating databases in relational database management systems. On Upwork, the world’s largest online workplace, companies hire SQL developers to successfully complete jobs including providing support, troubleshooting and setting up/ managing databases.

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SQL Job Cost Overview

Typical total cost of Upwork SQL projects based on completed and fixed-price jobs.

Upwork SQL Jobs Completed Quarterly

On average, 406 SQL projects are completed every quarter on Upwork.

406

Time to Complete Upwork SQL Jobs

Time needed to complete a SQL project on Upwork.

Average SQL Freelancer Feedback Score

SQL Upwork freelancers typically receive a client rating of 4.67.

4.67
Last updated: July 1, 2015
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  1. Vitaly Soltysyak

    Vitaly Soltysyak

    MQL/Forex API Developer, MetaQuotes support, SQL Developer, RDB design

    Russia - Last active: 14 days ago - Tests: 5 - Portfolio: 3

    Primary skills: EA, indicators or scripts, any logic, any complexity. Adaptation, modification and optimization. MQL4 and MQL5. Forex Connect API development. Support and configuration of the MetaQuotes software (trading servers, backup servers, data centers, reporting service, bridges, feeds, etc). Developing of plugins for MetaQuotes Trading Servers. MT4 Server API, MT4 Manager API. ANSI SQL query programming; DB enterprise architecture modeling; DB structure and data modeling; T-SQL programming; SQL queries/storeds and DB model optimization.

    $33.33 /hr
    18 hours
    4.42
  2. Pasqualino Ferrentino

    Pasqualino Ferrentino

    Software Architect

    Italy - Last active: 13 hours ago - Tests: 17 - Portfolio: 1

    I am a computer scientist whose main skills are in the field of data analysis, pattern recognition, statistical software, machine learning and large scale system design and integration. I have developed systems using Neural Networks, Markov chains, Support Vector Machines in various applications: OCR, image processing, data analysis, text indexing and retrieval. I am also proficient in 3D image visualization using common off the shelf libraries and methodologies, either low or high level, like OpenGL, DirectX, VTK, Java3D. I understand and use common ray tracing programs. I understand image processing topics like segmentation, thresholding, classification. I have worked in the past in a 3d Face recognition European project. I know the OpenCV library quite well. In the field of "general programming" I have a good understanding of Databases, multi threaded applications, sockets, pipes, encryption (symmetric and asymmetric), compiler design, operating systems, low level data structure in memory and on disk, data integrity. I consider myself an expert in data structures and algorithms: trees, queues, lists, b-trees, hash tables; I use standard libraries like STL, Boost, Java generics. I have a good knowledge of SQL and data normalization however I have also used custom No-SQL databases like Datadraw, MapDB, Tokyo Cabinet, Zope. I know all the basic algorithms and templates used in every day coding; regarding data integrity and security. Compression (lossy and lossless), symmetric and asymmetric encryption, public certificates, I have worked with OpenSSL programming, encrypted web services, packet sniffers. I am proficient in all the common every day languages with an emphasis on C++ and Perl. But I can use: Java, Python, Visual Basic, C#, PLSQL, Delphi. I know all the Object Oriented Programming concepts and design patterns and I use them if the need arises, but I am also able to write object-free programs in C or functional languages (like Haskell or Scheme). I know modern version control systems like git and mercurial, even if I can use also older ones like Subversion or CVS. I know Windows programming and API quite well. I have used WPF and WCF to create desktop applications in Windows and web services. I have used Linux and Gui toolkits like Qt which are platform independent. I know XML, XSL, I have used several parsers like the MsXML or Xpath. I know how to validate a XML with a schema. I have worked with a team that handled thousands of XML documents relating to air crashes in a SQL server database. I am able to talk and write in English with fluency. If anything is not listed here either I have forgotten to list it or I can probably learn it quite fast, so don't hesitate in asking!

    $24.41 /hr
    7,091 hours
    4.97
  3. Kimani W.

    Kimani W.

    Expert Web developer with great backend and frontend skills

    Jamaica - Last active: 7 days ago - Tests: 4 - Portfolio: 3

    I am an expert developer with over 4 years professional web development experience. I have a deep interest in designing polished, secure, efficient, and user friendly web applications. I am knowledgeable about the different layers of the web stack, best practices, and current technologies such as HTML5, Ajax, REST, and NoSQL.

    $33.33 /hr
    1,088 hours
    4.99
  4. Amelia Pessoa

    Amelia Pessoa

    Software Engineer and Pentaho Developer

    Brazil - Last active: 15 days ago - Tests: 1 - Portfolio: 1

    Oracle Certificated Java Programmer; Microsoft Technology Associate - Database Administration Fundamentals; and Microsoft Student Partner. * BI solutions using Pentaho ETL, CDE/CDF/Ctools & Reports.; * Creations Web Site and application development with Java (JSP, EL, Servlets, JSTL, JSF, Primefaces), PHP, Ajax, CSS, JavaScript (and jQuery); * CMS's: Joomla and Wordpress; * Mobile: Android e PhoneGap; * Data Bases SQL Server, H2, Oracle, Postgrees and MySQL (Development, Creating and Maintaining Stored Procedures, Triggers, Reports).

    $27.78 /hr
    0 hours
    5.00
  5. Jacob F.

    Jacob F.

    Software Engineer

    United States - Last active: 1 month ago - Tests: 2 - Portfolio: 3

    Over 8 years experience building ground-up web applications utilizing .NET (C#), ASP.NET, SQL Server and javascript (AJAX, jQuery) to provide rich, interactive, and user friendly experiences. I focus on writing clean code and simple, ease to use interfaces. Additional Skills: HTML, CSS, XML, Windows Azure, Web Design, Information Dashboards, SQL Server

    $50.00 /hr
    0 hours
    5.00
  6. Alexander Katkov

    Alexander Katkov

    Web developer

    Russia - Last active: 1 month ago - Tests: 5

    I started to develop business applications in 2004. I took part in projects of different sizes and subjects in the past 10 years. I have an experience of working alone, as part of the team and as a team leader. I’m focused on web development using .NET Framework, but also have experience in .NET desktop applications and windows services. I'm an expert in ASP.NET, .NET MVC, JavaScript, jQuery, MS SQL Server. I'm familiar with WCF, WPF, MySQL, MongoDB, MS Analysis Services, Entity Framework, .NET Web API.

    $20.00 /hr
    28 hours
    5.00
  7. alexander Merkulov

    alexander Merkulov Agency Contractor

    Asterisk/voip/a2billing/freepbx/kamailio expert

    Ukraine - Last active: 4 days ago - Tests: 6 - Portfolio: 5

    My time is my value. So when you choosing me you can expect that job will be done in short terms and perfect. I not like to do something that not need be done, i prefer use developed components and solutions. That not mean i can't do development. I working with different programing tasks for last 26 years. yes, from 6 y.o. I live in it. So i prefer do something new&interesting; I can handle all tasks from linux administration/virtualization upto end-user web for voip. Only task i never do - graphical design part. That is not my field, better hire someone else for design. I have university degree, working with asterisk from start of this project. Have developing experience with freepbx/trixbox&a2billing. I am one of contributor of a2billing.org trunk. Also i can work as mysql/postgres DBA, database architect, has experience with following languages: Perl Python PHP C/C++ Javascript SQL Prolog/Lisp,Forth. In voip i can work with callweaver, asterisk, opensips, kamailio. Developed modules for freepbx, elastix, trixbox, a2billing.

    Associated with: UA Prime Agency

    $67.77 /hr
    545 hours
    4.97
  8. Vadzim Marozau

    Vadzim Marozau Agency Contractor

    iOS developer, Web Developer with ASP.NET MVC experience

    Belarus - Last active: 1 day ago

    Results-oriented software developer with 2.5 years experience in development. I make it my goal to create software with the user in mind, creating applications with a useable and intuitive user interface experience. I also understand the importance of creating highly readable and easily maintainable source code. I am constantly striving to learn new technologies and look to ways to better myself in this rapidly changing industry. TECHNICAL SKILLS Languages: Objective C, Javascript, C#, JSON, SQL, HTML Databases: SQLite, MS SQL, MySQL Development Software: XCode, Visual Studio, Git Platforms: Mac OSX, Windows

    Associated with: Panda Systems

    $20.00 /hr
    303 hours
    4.40
  9. Eduard Bagrov

    Eduard Bagrov Agency Contractor

    C/C++/C sharp/PHP/HTML/MySql/SQL Senior Software Developer

    Armenia - Last active: 16 days ago - Tests: 7 - Portfolio: 3

    I'm Senior Software Developer with 7+ years experience. What I usually do: 1) Scraping projects 2) Embedded programming 3) Kernel module programming 4) Unit testing (cunit, Nunit) 5) Desktop and Web applications development 6) Java Android games development Languages: C/C++ (X11, STL, GTK+) C#, asp.net Java Android Phyton PHP, HTML MSSQL, MySql

    Associated with: SYP

    $22.22 /hr
    206 hours
    5.00
  10. Md Shiefuzzaman

    Md Shiefuzzaman Agency Contractor

    .NET Developer

    Bangladesh - Last active: 6 days ago - Tests: 4 - Portfolio: 2

    * 8 years professional working experience as a software developer in .NET platform with proficiency in designing, developing and testing object oriented, client server and web based applications. * In depth experience in life cycle of design, development, specification, testing and documentation. * Experience in developing applications using C#, ASP.NET, ADO.NET Data, LINQ, Entity Framework, ASP.NET Web services, AJAX Control Toolkit, Telerik Toolkit, JQUERY, JAVA Script, XML, SQL server, ORACLE and Code Smith on Windows. * Through understanding and hands on experience on Relational Database Management Systems: ORACLE (9i, 10g, 11g), SQL Server (2000, 2005, 2008, 2008R2 (at present)). * Experience in architectural standard of framework Façade, Observer, and Singleton Pattern. * Extensively used Visual Studio 2003, 2005, 2008 and 2010 (at present) for development of different applications. * Expertise in SQL, designing and implementing Stored Procedure and Triggers in SQL Server. * Hands on experience in multiple version control systems like SVN, Visual SVN, TFS, GIT

    Associated with: devs' arena

    $12.00 /hr
    74 hours
    5.00