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Not so long ago, the task arose to teach a person SQL. www.sql-ex.ru turned out to be full of unnecessary (?) information. I had to write a very concise SQL course myself. There is only the most necessary to learn how to write any queries for data sampling.
If it helps you, I'll be glad.
C sqlite
Then learn how to do 1-2-3nf, Boyce-Codd
Then practice on an object-relational DBMS Postgresql
Optional: Oracle, DB2, muscle, msskul
Working with the database is relevant on PDO , SQL itself can be learned from any video course
. Here are a couple more useful links: another YouTube channel
https://www.politerm.com/zuludoc/spatial_query_sql.htm
ruseller.com/lessons.php? 557
PDO
ruseller.com/lessons.php?rub=37&id=1463
labdes.ru/php-pdo-mysql-examples
symbol ->
ruseller.com/lessons.php?id=1145
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