Question: what are substrings in sql?
Answer: Description. In SQL Server (Transact-SQL), the SUBSTRING functions allows you to extract a substring from a string.
Syntax. The syntax for the SUBSTRING function in SQL Server (Transact-SQL) is: SUBSTRING( string, start_position, length ) ... 
Note. The first position in string is 1. ... 
Applies To. ... 
Example.