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Oracle® Database SQL Language Reference
11g Release 1 (11.1)

B28286-07
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POWERMULTISET_BY_CARDINALITY

Syntax

Description of powermultiset_by_cardnlty.gif follows
Description of the illustration powermultiset_by_cardnlty.gif

Purpose

POWERMULTISET_BY_CARDINALITY takes as input a nested table and a cardinality and returns a nested table of nested tables containing all nonempty subsets (called submultisets) of the nested table of the specified cardinality.

Examples

First, duplicate the elements in all the nested table rows to increase the cardinality of the nested table rows to 2:

UPDATE customers_demo
  SET cust_address_ntab = cust_address_ntab MULTISET UNION cust_address_ntab;

Now, select the nested table column cust_address_ntab from the customers_demo table using the POWERMULTISET_BY_CARDINALITY function:

SELECT CAST(POWERMULTISET_BY_CARDINALITY(cust_address_ntab, 2)
         AS cust_address_tab_tab_typ)
  FROM customers_demo;

CAST(POWERMULTISET_BY_CARDINALITY(CUST_ADDRESS_NTAB,2) AS CUST_ADDRESS_TAB_TAB_TYP)
  (STREET_ADDRESS, POSTAL_CODE, CITY, STATE_PROVINCE, COUNTRY_ID)
----------------------------------------------------------------------------------------
CUST_ADDRESS_TAB_TAB_TYP(CUST_ADDRESS_TAB_TYP
  (CUST_ADDRESS_TYP('514 W Superior St', '46901', 'Kokomo', 'IN', 'US'), 
   CUST_ADDRESS_TYP('514 W Superior St', '46901', 'Kokomo', 'IN', 'US')))
CUST_ADDRESS_TAB_TAB_TYP(CUST_ADDRESS_TAB_TYP
  (CUST_ADDRESS_TYP('2515 Bloyd Ave', '46218', 'Indianapolis', 'IN', 'US'), 
   CUST_ADDRESS_TYP('2515 Bloyd Ave', '46218', 'Indianapolis', 'IN', 'US')))
CUST_ADDRESS_TAB_TAB_TYP(CUST_ADDRESS_TAB_TYP
  (CUST_ADDRESS_TYP('8768 N State Rd 37', '47404', 'Bloomington', 'IN', 'US'), 
   CUST_ADDRESS_TYP('8768 N State Rd 37', '47404', 'Bloomington', 'IN', 'US')))
. . .

The preceding example requires the customers_demo table and a nested table column containing data. Refer to "Multiset Operators" to create this table and nested table columns.