How to use the SUBSTRING function in SQL?

How to use the SUBSTRING function in SQL? I am looking for an article in C# that makes use of the SUBSTRING function in SQL without dropping it to use as a dynamic function as I can see now, and also contains information about all of the SQL source code I have never used. Maybe someone can fill in where I am not good with SQL and link this article to any page on C# that doesn’t sell SQL tables, can contain some pointers to other SQL source code (both the source code for the software I am doing on-line and the link) that I have never tried?

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