Where is SQL used?

Question

SQL

I understand perfectly well that now everything is written on it, but specific examples are needed. And so that you can describe in detail the details, processes. Thanks in advance to those who respond.

Answer 1

Any site that works with a large amount of data in the slightest degree uses relational databases (not counting, of course, any exotic, such as NOSQL, storing data in text files, etc.), SQL is a language for extracting data from such databases.
For example, there was a need to display on the Toaster page all the questions that you asked, an example of an SQL query that will display them

SELECT * 
FROM questions
WHERE userName='YourOwnSenpaie'
/*
* -  означает, что выбираем все поля (имя, фамилию, ник, e-mail и т д)
questions - название таблицы, хранящей вопросы
WHERE userName='YourOwnSenpaie' - условие, означающее, что выбирать нужно только ваши вопросы, а не чужие
*/

Answer 2

tin lazy students went
well, at least he writes something, and did not download the essay

Answer 3

Where there is a need for a relational data model.
https://ru.wikipedia.org/wiki/SQL
Download any framework with ORM.

Answer 4

All data is now in databases. SQL is needed today in order to be able to select data according to complex conditions. For example, to select only Ivanov Ivanovich whose year of birth is from 1980 to 1990, this is what SQL allows

Answer 5

Guys, sorry, but I asked for specific examples. Famous sites, programs. Do search engines, for example, work with SQL? I already checked Wikipedia myself, and I know what the language is for.