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Alex T.

PHP Developer with strong knowledge of MySQL/ HTML/ CSS/...

A highly resourceful and competent PHP developer with extensive experience in layout coding of websites specifically...
UTC+02:00 (Ukraine/Kyiv)
$80,640 / Year
$6,720 / Month
$40 / Hour

Vadym G.

Senior PHP Developer

A highly resourceful, innovative, and competent web developer with 10+ years of experience in building and optimizing...
UTC+02:00 (Ukraine/Kyiv)
$101K$90,720 / Year
$8,400$7,980 / Month
$50 / Hour

Mykola M.

Experienced web developer with strong knowledge of...

I am a Web Developer well familiar with UX design concepts. Experienced in project control and team management tools...
UTC+02:00 (Ukraine/Kyiv)
$50,400 / Year
$4,200 / Month
$25 / Hour

Eugene N.

PHP/SQL developer

WEB applications development Front-end development
UTC+03:00 (Europe/Minsk)
$70,560 / Year
$5,880 / Month
$35 / Hour

Daniel C.

Certified Java dev. experience with AWS cloud and SQL and...

3y exp in multinational fin-tech, e-gov, and e-commerce projects. Oracle Java Certification Preparation experience...
UTC+02:00 (Europe/Chisinau)
$92,736 / Year
$7,728 / Month
$46 / Hour

Yurii B.

MS SQL Server Database Administrator

Competent IT professional with 4+ years of experience in database management, administration, and maintenance....
UTC+02:00 (Ukraine/Kyiv)
$86,688$78,019 / Year
$7,224 / Month
$43 / Hour

Oleksandr B.

ETL, DWH, SQL, Pentaho DB developer

Hard Skills ● MSTR delivery pipeline, ● SAP Hana and SSRS maintenance ● Creation, integration and further...
UTC+02:00 (Ukraine/Kyiv)
$117K$105K / Year
$9,744$9,257 / Month
$58 / Hour

Alfonso M.

Senior .NET C# Developer / SQL Server

UTC-05:00 (America/Bogota)
$90,720 / Year
$7,560 / Month
$45 / Hour

David L.

Senior software developer with strong knowledge of SQL...

I'm a very experienced software developer with knowledge in SQL and nonSQL databases. I've programmed in many...
UTC-05:00 (America/Bogota)
$94,752 / Year
$7,896 / Month
$47 / Hour

Pradip B.

Senior Data Engineer | Spark-Scala-Python-SQL-Big...

Reliable data engineer with 6+ years of proven industry experience in data lake development, data analytics,...
UTC+05:45 (Asia/Kathmandu)
$80,640 / Year
$6,720 / Month
$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.