Metasploit & Nmap Scan Problem

hello, I have a small issue i've been trying to solve here but can't seem to figure out as I am quite new

I try and scan for MSSQL open ports for say a website, and I use metasploit command like so:

use auxiliary/scanner/mssql/mssqlping

and this is what it says: the execution is complete, but doesn't show me any information about the port, if there are any myssql instances. it only says the scanning is complete.

so I tried with nmap and it works when I scan for TCP ports, but when I scan for UDP ports it starts the scan, but never finishes. I dont know if this means it needs a lot of minutes say, 20 or 10, but I have waited probably about 3-4 and it doesnt finish. What am I doing wrong? I need to scan for myssql instances to see where the Database is hidden on a website

any help is very appreciated