The smallest unit of data that can be manipulated in SQL is called a value. Values are interpreted according to the data type of their source. Sources include:
- Constants
- Columns
- Functions
- Expressions
- Special registers.
- Variables (such as host variables, SQL variables, global variables, parameter markers, module variable, and parameters of routines)
- Boolean values
DB2® supports a number of built-in data types. It also provides support for user-defined data types. Figure 1 shows the supported built-in data types.
All data types include the null value. The null value is a special value that is distinct from all non-null values and thereby denotes the absence of a (non-null) value. Although all data types include the null value, columns defined as NOT NULL cannot contain null values.
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