C# 9 & SQL descripción

Learning C# and SQL syntax on specific code examples.
✓ C#:
- How to get a substring?
- How to declare a generalized method?
- How to perform a database query?
✓ SQL:
- How to combine multiple tables in a single query?
- How to sort the result of grouping data?
- What types of data are there in SQL Server?
These and over 400 of other code samples are available in the application.