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Igor R.

Full Stack Web Developer (PHP/JavaScript)

6+ years of professional experience as a PHP/JavaScript developer. Implemented and maintained raw PHP, JavaScript...
UTC+02:00 (Ukraine/Kyiv)
$45 / Hour

Oleksii R.

iOS Developer

9+ years of commercial experience in software development for iOS. The primary focus is business applications and...
UTC+02:00 (Ukraine/Kyiv)
$47 / Hour

Bohdamyr S.

Skilled Java Engineer fluent with the latest back end...

Java Software Engineer with analytical thinking, unique ability to understand clients’ needs and create clean and...
UTC+02:00 (Ukraine/Kyiv)
$50 / Hour

Hlieb H.

Passionate Java Engineer, who comes to the table with the...

Java Software Engineer with analytical thinking, unique ability to understand clients’ needs and create clean and...
UTC+02:00 (Ukraine/Kyiv)
$50 / Hour

Mykola B.

Dedicated Java Engineer

Java Software Engineer, who can own the whole problem, following trends and best practices, top-notch lead developer...
UTC+02:00 (Ukraine/Kyiv)
$47 / Hour

Taras G.

Talented Java Engineer with strong expertise in front-end...

Taras has started his career as a Java Engineer and throughout his work he gained vast experience in front-end...
UTC+02:00 (Ukraine/Kyiv)
$42 / Hour

Volodymyr G.

Data Scientist with PhD background in Economics

A skilled Data Scientist with over 10 years of experience in data mining activities, data preparation, data analysis,...
UTC+02:00 (Ukraine/Kyiv)
$41 / Hour

Oleg K.

Senior Java Developer with strong AngularJS background

Proficient in Java, JavaScript and AngularJS programming languages. 2+ years of experience in Liferay and React.js...
UTC+02:00 (Ukraine/Kyiv)
$58 / Hour

Alex K.

Senior full-stack ninja who loves reactive programming...

Eight years of professional experience. Core stack: HTML5, CSS3 with SCSS, JavaScript ES6+, Typescript, Node.js with...
UTC+02:00 (Ukraine/Kyiv)
$50 / Hour

Yevhen M.

Java Software Engineer

Java Software Engineer, with almost four years of experience in server side developing, testing, and debugging, who...
UTC+02:00 (Ukraine/Kyiv)
$40 / Hour

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Seven Major Skills any Dedicated SQL Developer Must Have

SQL (Structured Query Language) is a query language for relational databases. It allows to manipulate (extract, edit, delete, change the structure, etc.) the information, which is stored and systematized by specialized software – DBMS (database management system). Currently, SQL (for the most part in Oracle implementation) remains the most popular of the database manipulation languages.

The declarative nature of the language as compared to more traditional imperative ones, such as C# or JavaScript, make it hard even for the experienced Chief Technical Officer to hire a SQL programmer with required qualifications. The declarative programming paradigm defines the computing process by describing its logic as opposed to describing the logic of the controlling program, inherent to imperative programming. The former describes WHAT must be done, the latter – HOW it must be done. The specific implementation of database manipulation mechanisms is assigned to DBMS and varies between different vendors.

Thus, we strive to provide the seven major knowledge areas a professional SQL developer should have experience with.

A competent SQL programmer should have:

  1. Solid knowledge of the database design theory, in particular, normalization, data integrity, data definition, data modelling, database indexing.
  2. Knowledge of database programming technologies (writing stored procedures, functions, views).
  3. Knowledge and experience with common data exchange formats (XML, JSON).
  4. Knowledge of the principles and methods of database backup and recovery.
  5. Knowledge of the security regulations of the target DBMS, the principles of user access levels and privileges delimitation.
  6. Good knowledge of the target DBMS and its tools, knowledge of the principles and features of the installation and operation of a particular DBMS in various operating systems and environments.
  7. Knowledge of ways to assess the performance of databases and optimize it, execution plans and index maintenance routines.

Upgraded versions of the basic SQL standard that most software vendors have developed over the years include a large number of advanced features, such as window functions, common table expressions and much more. Knowledge of such subtleties makes it easy to separate real professionals from novice or non-core developers. We hope this checklist will help you to make a good hiring decision.