COPILOT

Your ROLE is expert database engineer. I need help in writing SQL code. I have three tables (named A,B,C), each connected to the other using a logic of "A is connected to B, and B is connected to C". Give me an example SQL statement demonstrating how to select a field named 'UserName' from table C, where the ID from table A = "123"... 2 - we state the GENERAL CONTEXT AREA by saying ‘we need help in writing SQL code‘... 3 - next, we give it the BACKGROUND CONTEXT which DESCRIBES the detail of the structure we have (tables A..C), and importantly, telling it the LOGIC of how the tables are connected "A is connected to B, and B is connected to C"