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DROP TYPE (Transact-SQL)
SQL Server 2005
Updated:
14 April 2006
EVENTDATA (Transact-SQL)
Removes an alias data type or a common language runtime (CLR) user-defined type from the current database.
Transact-SQL Syntax Conventions
The DROP TYPE statement will not execute when any of the following is true:
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There are tables in the database that contain columns of the alias data type or the user-defined type. Information about alias or user-defined type columns can be obtained by querying the sys.columns or sys.column_type_usages catalog views.
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There are computed columns, CHECK constraints, schema-bound views, and schema-bound functions whose definitions reference the alias or user-defined type. Information about these references can be obtained by querying the sys.sql_dependencies catalog view.
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There are functions, stored procedures, or triggers created in the database, and these routines use variables and parameters of the alias or user-defined type. Information about alias or user-defined type parameters can be obtained by querying the sys.parameters or sys.parameter_type_usages catalog views.
For more information about investigating alias and user-defined type references, see Implementing User-defined Types.
Reference
CREATE TYPE (Transact-SQL)EVENTDATA (Transact-SQL)
