WordPress plugins for database queries

I don’t know of a plugin that allows you to do this out of the box, but as you are (/seem to be) comfortable with database manipulation, I’ve outlined below how you can achieve what you want using custom coding.

You can run custom queries using the wpdb-class. There are a few posts on WPSE/SO that treat this. Once you’ve set those up, you can run them on, for example, a custom admin page (a new page in the WordPress Dashboard). There are various tutorials available online (such as this one) that show how that can be done.

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