COLLECT

Syntax

Description of the illustration collect.gif

Purpose

COLLECT takes as its argument a column of any type and creates a nested table of the input type out of the rows selected. To get the results of this function you must use it within a CAST function.

If column is itself a collection, then the output of COLLECT is a nested table of collections.

Examples

The following example creates a nested table from the varray column of phone numbers in the sample table oe.customers:

CREATE TYPE phone_book_t AS TABLE OF phone_list_typ;
/
SELECT CAST(COLLECT(phone_numbers) AS phone_book_t) 
   FROM customers;