Oracle Database supports user-defined data types that make it possible to model real-world entities as objects in the database. Collection types are object data types for modeling multi-valued attributes. Nested tables are collection types. Nested tables can be used anywhere that other data types can be used. You can learn more about collection types in Oracle Database Object-Relational Developer's Guide.
Oracle Data Mining supports the following nested object types:
DM_NESTED_BINARY_DOUBLESDM_NESTED_BINARY_FLOATSDM_NESTED_NUMERICALSDM_NESTED_CATEGORICALSDescriptions of the nested types are provided in Example 3-4.
Example 3-4 Oracle Data Mining Nested Data Types
describe dm_nested_binary_double Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE BINARY_DOUBLE describe dm_nested_binary_doubles DM_NESTED_BINARY_DOUBLES TABLE OF SYS.DM_NESTED_BINARY_DOUBLE Name Null? Type ------------------------------------------ -------- --------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE BINARY_DOUBLE describe dm_nested_binary_float Name Null? Type ----------------------------------------- -------- --------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE BINARY_FLOAT describe dm_nested_binary_floats DM_NESTED_BINARY_FLOATS TABLE OF SYS.DM_NESTED_BINARY_FLOAT Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE BINARY_FLOAT describe dm_nested_numerical Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE NUMBER describe dm_nested_numericals DM_NESTED_NUMERICALS TABLE OF SYS.DM_NESTED_NUMERICAL Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE NUMBER describe dm_nested_categorical Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE VARCHAR2(4000) describe dm_nested_categoricals DM_NESTED_CATEGORICALS TABLE OF SYS.DM_NESTED_CATEGORICAL Name Null? Type ----------------------------------------- -------- ---------------------------- ATTRIBUTE_NAME VARCHAR2(4000) VALUE VARCHAR2(4000)