SQL tutorial

SQL subqueries are queries attached to another query. Subqueries can be used:In the SELECT instruction; In the FROM instruction; In the WHERE condition.What is a subquery in SQL? The...

Select SQL - I don't intend to go into sql, you can read about it in any guide to sql server,mysql mainly supports all the basic commands of the ansi 92 standard,but the select command deserves...

SQL injection is a dangerous vulnerability that occurs due to insufficient filtering of data entered by the user, which allows you to modify queries to databases.The result of the SQL...

UPDATE command - makes changes to an already existing record or to a set of records in an SQL table. Changes the existing values in the table or in the main view table. UPDATE command. Syntax...

 The SQL JOIN language operator is intended for connecting two or more database tables by a matching condition. This operator exists only in relational databases.It is thanks to JOIN...

SQL is a language specifically oriented towards relational databases (RBDs). It does a lot of work that you would have to do if you had used a universal programming language such as C. To form a...

SQL is often called the language of Esperanto for Database Management Systems (DBMS). Indeed, there is no other Database Management System (DMS) language in the world that is so widely used in...

PROS AND CONS - Independence from a specific DBMS Despite the presence of dialects and syntax differences, most of the SQL query texts containing DDL and DML can be easily transferred from one...