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In this tutorial, I will show you how to build and query from a very simply table function, one that returns an array of strings (and, more generally, scalars). The next tutorial will show you how to work with table functions that return collections of multiple columns.
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Table functions are used to return PL/SQL collections that mimic tables. They can be queried like a regular table by using the TABLE operator in the FROM clause. Regular table functions require collections to be fully populated before they are returned.
Pipelined table functions are table functions that return or “pipe” rows back to the calling query as the function produces the data in the desired form—and before the function has completed all of its processing.
I'm trying to create a function in package that returns a table. I hope to call the function once in the package, but be able to re-use its data mulitple times. While I know I create temp tables in Oracle, I was hoping to keep things DRY. So far, this is what I have: Header: CREATE OR REPLACE PACKAGE TEST AS . TYPE MEASURE_RECORD IS RECORD (
Table functions are functions that produce a collection of rows (either a nested table or a varray) that can be queried like a physical database table. You use a table function like the name of a database table, in the FROM clause of a query. A table function can take a collection of rows as input.
A table function is a function you can use like a table in the FROM clause of a SELECT statement. A common usage of table functions is to stream data directly from one process or transformation to the next process without intermediate staging, and a table function used in this way is called a streaming table function.
This tutorial covers the fundamental features and behavior of pipelined table functions. You may also want to explore parallel-enabling pipelined table functions. Follow the links at the bottom of this tutorial for more details on this topic.
