The %TYPE attribute lets use the datatype of a field, record, nested table, database column, or variable in your own declarations, rather than hardcoding the type names.
You can use the %TYPE attribute as a datatype specifier when declaring constants, variables, fields, and parameters. If the types that you reference change, your declarations are automatically updated.
This technique saves you from making code changes when, for example, the length of a VARCHAR2 column is increased. Note that column constraints, such as the NOT NULL and check constraint, or default values are not inherited by items declared using %TYPE.
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