I wouldn't quite use this as a solid recommendation (because gross php), but on a web server with PHP and MySQL, you could use phpMyAdmin which is a database manager packed into a GUI.
I apologize if this isn't what you are looking for, though
I'm more looking to make my own app (hoping it can be something to show potential employers) so just trying to figure out what the best language to use would be, but that looks like it might be useful for testing, so I don't have to add/remove/change test data manually.
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