Table Relationship Event Participants and Custom Fields Used In event profile
This should be useful for users and implementors that want to better understand the different CivICRM objects and tables and how they are related, and how they are stored in the database.
Most of the common objects in CivICRM (like contacts, activities, memberships, relationships, groups), are stored in the database as one or more tables. Most of the tables that represent common CRM objects (like contacts, activities, relationships), etc. can be segmented into different types. Most objects can be extended by adding custom data.
Table automatically created when we are making new group of custom fields.