You can give a table or a column another name by using an alias. This can be a good thing to do if you have very long or complex table names or column names.
An alias name could be anything, but usually it is short.
SQL Alias Syntax for Tables
SELECT column_name(s)
FROM table_name
AS alias_name
FROM table_name
AS alias_name
SQL Alias Syntax for Columns
SELECT column_name AS alias_name
FROM table_name
FROM table_name