Nice easy question that I actually got hit with recently. Code that had been running live for 11 years, someone reported it was missing a column. Went digging and saw the missing comma. Quick easy fix, but when the code is NOT formatted nicely (ie all selected columns on one line), a missing comma is INCREDIBLY difficult to find.
Thankfully tools exist (free and paid) to do code formatting and ran that and it was quickly obvious what was wrong.
The above is all just my opinion on what you should do.
As with all advice you find on a random internet forum - you shouldn't blindly follow it. Always test on a test server to see if there is negative side effects before making changes to live!