Dataedo is a great tool to discover and classify columns in your databases holding sensitive data. Classification is made with the use of labels in custom fields. There are two main methods:
Manual discovery and classification
All users can manually find and classify data in databases using custom fields and search functions.
Manual data search and classification
Automated discovery and classification
Dataedo 7.5 Enterprise has a convenient automated data discovery and classification functionality with built in predefined functions for PII and GDPR that scans entire repository and suggests labels.