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Removes a domain (data type) from the database.
DROP DOMAIN domain-name
DROP DOMAIN is prevented if the data type is used in a table column, or in a procedure or function argument. You must change data types on all columns defined using the domain to drop the data type. It is recommended that you use DROP DOMAIN rather than DROP DATATYPE, as DROP DOMAIN is the syntax used in the ANSI/ISO SQL Standard. You cannot drop system-defined data types (such as MONEY or UNIQUEIDENTIFIERSTR) from a database.
You must be the owner of the domain, or have the DROP DATATYPE or DROP ANY OBJECT system privilege.
Domain support is optional SQL Language Feature F251.
The following example creates and then drops the domain CustPhoneNumber.
CREATE DOMAIN CustPhoneNumber CHAR(12) NULL; DROP DOMAIN CustPhoneNumber;