I love that you included explanations with your code. This makes perfect sense to me now.

That's a massive amount of code. I'm in awe that you were able to keep track of where you were.

Thank you. I must've deleted all that by mistake.

It's in the initial code:

SELECT /* your query - you are given columns a, b, and c */ AS res FROM expression_matter;

is the table name missing in the instructions?

I thought the following code was the answer, but it's not. It passed during the initial test but failed 1 test case on the attempt. Maybe I need to take a break, but I can't see what's wrong with this.

select ('Hello, ', name , ' how are you doing today?') as greeting
from person

Why didn't you have to specifically use the CONCATENATE statement within the select statement?