Types of databases
This course is designed to help you master the query language for relational databases, which are unconditionally ahead of other types of databases in popularity.
But I want you to understand that databases are not limited only to them. Therefore, we will also get acquainted very briefly with other representatives of the database family. You can regard it as a visit to the zoo 🦁 – to quickly and briefly see unusual creatures.
Of course, we will pay special attention to relational databases in the future.
There are quite a lot of database classifications, but let's focus on the most popular ones:
Relational
id
name
1
Anna
2
Boris
Data in linked tables — rows and columns
Key-value
user:1→Anna
user:2→Boris
Fast access to a value by its key
Document-oriented
{
"name": "Anna",
"role": "admin"
}
Flexible documents in JSON format