Sp_addtype not null

Alias data type names must follow the rules for identifiers and must be unique in each database. Quotation marks are required around all parameters that have embedded blank spaces or punctuation marks. P Is a nonnegative integer that indicates the maximum total number of decimal digits that can be stored, both to the left and to the right of the decimal point. For more information, see decimal and numeric Transact-SQL. Nullability should be explicitly defined. If nullability is explicitly defined when the alias data type is used during table creation, it takes precedence over the defined nullability.

An alias data type name must be unique in the database, but alias data types with different names can have the same definition. If the alias data type must be available in all new user-defined databases, add it to model.

Alias data types inherit the default collation of the database. Changing the default collation of the database applies only to new columns and variables of the type; it does not change the collation of existing ones. Alias data types cannot be defined by using the SQL Server timestamp , table , xml , varchar max , nvarchar max or varbinary max data types. The following example creates an alias data type named ssn social security number that is based on the SQL Server-supplied varchar data type.

The ssn data type is used for columns holding digit social security numbers The column cannot be NULL. Notice that varchar 11 is enclosed in single quotation marks because it contains punctuation parentheses.

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