User-defined types obtain their characteristics from the methods and operators of a class that you create by using one of the programming languages supported by the. For more information about alias data types, see CREATE TYPE (Transact-SQL). Alias data types are based on the system-supplied data types. You can also define your own data types in Transact-SQL or the Microsoft. SQL Server supplies a set of system data types that define all the types of data that can be used with SQL Server. A data type is an attribute that specifies the type of data that the object can hold: integer data, character data, monetary data, date and time data, binary strings, and so on. In SQL Server, each column, local variable, expression, and parameter has a related data type.
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