Use Nerdy's Duplicate Checker to the backend page (or anywhere) and relate to the Main Database you want to check for duplicate(s)! Just follow the easy to follow instructions and the process can be repeated across all your systems!
I had a use case for this checker for work where I was entering unique ID numbers and I needed to make sure I wasn't repeating the same IDs. So I spent today trying to find a way and I did! I am just so giddy that it worked for unique id systems!
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Nerdy's Duplicate Checker