We'd expect the SQL statement you are running to throw Error 1064 You have an error in your SQL syntax, due to the dash character in the column alias.
But likely you aren't seeing that error, because you aren't checking whether the query was successful.
To use the dash character in an identifier, you will need to "escape" the identifier; the normal pattern in MySQL is to either to enclose the identifier in backtick characters, or to to use an identifier that doesn't require escaping.
SELECT foo AS `Prio-Tickets` ...
SELECT foo AS prio_tickets ...
It's good practice to check the return from the query, and to appropriately handle the error, rather than having your code put it's figurative pinky finger to the corner of it's mouth Dr. Evil style "I'm just gonna assume it all went to plan. What?"
Since the mysql interface is deprecated (and new development should be using either the mysqli or PDO interface), I'm not not going to provide an example using the mysql interface; there's plenty of examples already available elsewhere.