sp_droptype (Transact-SQL)
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sp_droptype (Transact-SQL)


Applies To: SQL Server 2014, SQL Server 2016 Preview

Deletes an alias data type from systypes.

Applies to: SQL Server (SQL Server 2008 through current version).

Topic link icon Transact-SQL Syntax Conventions

sp_droptype [ @typename = ] 'type'

[ @typename =] 'type'

Is the name of an alias data type that you own. type is sysname, with no default.

0 (success) or 1 (failure)

The type alias data type cannot be dropped if tables or other database objects reference it.


An alias data type cannot be dropped if the alias data type is used within a table definition or if a rule or default is bound to it.

Requires membership in the db_owner fixed database role or the db_ddladmin fixed database role.

The following example drops the alias data type birthday.


This alias data type must already exist or this example returns an error message.

USE master;
EXEC sp_droptype 'birthday';

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