DDL Event Groups
The following illustration lists the DDL event groups that can be used to run a DDL trigger or an event notification, and also the Transact-SQL statements they cover. Note the inclusive nature of the event groups, as indicated by the tree structure of the diagrams. For example, a DDL trigger or event notification that specifies FOR DDL_TABLE_EVENTS covers the CREATE TABLE, ALTER TABLE and DROP TABLE Transact-SQL statements. A DDL trigger or event notification that specifies FOR DDL_TABLE_VIEW_EVENTS covers all Transact-SQL statements under DDL_TABLE_EVENTS, DDL_VIEW_EVENTS, DDL_INDEX_EVENTS, and DDL_STATISTICS_EVENTS.
Certain system stored procedures that perform DDL-like operations can also fire DDL triggers or event notifications. Test your DDL triggers and event notifications to determine their responses to system stored procedures that are run. For example, the CREATE TYPE statement and sp_addtype stored procedure will both fire a DDL trigger or event notification that is created on a CREATE_TYPE event.