Database

These checks allow you to ensure that a database record exists or doesn’t exist.

This is useful for unique constraints like username or email address.

Please be aware of the fact that MySQL searches are in most cases not case sensitive!

(https://dev.mysql.com/doc/refman/8.1/en/case-sensitivity.html)

TableLookup

Checks if the value of a field is or is not in a configured field in a configured table.