2.2. DATA REPRESENTATION
2.2.1. General Data Type Information
Every data value belongs to some data type such as INTEGER, CHARACTER, etc. Microsoft SQL Server Transact-SQL has a number of native data types, which are described in the next section.
In addition to the built-in, native data types, Transact-SQL provides for the definition of user-defined types, covered later in this chapter.
2.2.2. Domain and NULL Value
2.2.2.1. Domain
The domain of a column is the set of legal data type values for that column as determined by the data type assigned to the column and applicable constraints.
A domain value is any value within the domain. For example, a column called Age may have a data type of INT and a CHECK constraint that values must be between ...
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