Manual for IT Recruiters - IV. What databases are used for

You may often encounter terms such as SQL developer, PL/SQL developer, database specialist but may not know what these terms imply. Let’s look at this in today’s part of the Manual for IT Recruiters.

Almost all apps or pieces of software use a large amount of data, and this data must be stored somewhere – in a database. Imagine, e.g., an online store which displays thousands of products, or an accounting system where all a particular company’s accounts and documents are administered. Without a database, we wouldn’t have anywhere to save data to, and so would be unable to work with it. Databases usually comprise a number of tables, which are linked to each other in various ways. Look at the example below:


 

The entire database comprises 9 tables, linked to each other in various ways, or having various relations.


Database types

There are a large number of types of database, of which the most well-known and most used include:

  • MySQL
  • MSSQL
  • MSSQL Server
  • PL/SQL
  • Oracle db
  • PostgreSQL
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  • Java
  • Javascript
  • PHP
  • programming languages

What frameworks are, and the most commonly used ones

Besides requirements for knowledge of programming languages in job vacancies, there are also often requirements for knowledge of a particular framework. But what exactly is a framework? It is a programming language add-on, or one might say a package of components which makes programming in a particular language easier. Every programming language has a large number of frameworks. Let’s look at so

Vojtech Zahorsky
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  • Java
  • Javascript
  • backend
  • programming languages

Manual for IT Recruiters - V. Java and Javascript: the difference between them

One of the most common errors made by recruiters is mixing up Java and Javascript. These words are very similar, but their meaning and uses are entirely different. As we know from Chapter 3, Java and Javascript are two different programming languages. Java is most frequently used to develop backend parts of apps (that part which ensures functionality). In contrast, Javascript is used to develop th

Vojtech Zahorsky