This repository contains SQL files with examples, exercises, and notes on various subjects related to SQL database management. Each SQL file covers a specific topic and provides a practical guide along with sample queries and explanations.

1. CRUD.sql: SQL queries demonstrating CRUD operations (Create, Read, Update, Delete).
2. aggregate_functions.sql: Examples illustrating the usage of aggregate functions in SQL queries.
3. books_table.sql: SQL script to create a sample table for storing book information and to insert some data used later in other files.
4. constrains_alter_table.sql: SQL statements for adding constraints and altering tables.
5. data_types.sql: Explanation and examples of various data types in SQL.
6. logical_operators.sql: SQL queries demonstrating the usage of logical operators.
7. many-to-many.sql: SQL examples for handling many-to-many relationships in databases.
8. one_to_many_joins.sql: SQL queries illustrating one-to-many join operations.
9. selection.sql: SQL queries for selecting data from tables based on specific criteria.
10. string_functions.sql: Examples of string manipulation functions in SQL.
11. triggers.sql: SQL scripts demonstrating the usage of triggers for enforcing database integrity.
12. views-modes.sql: SQL queries and explanations related to views and modes.
13. window_functions.sql: Examples showcasing the usage of window functions in SQL queries.

Each SQL file contains SQL queries and explanations related to the respective topic. You can use these files for learning SQL concepts, practicing SQL queries, or as a reference guide when working on SQL databases.