Table Functions
Table functions are methods for constructing tables.
You can use table functions in:
- 
FROM clause of the SELECTquery.The method for creating a temporary table that is available only in the current query. The table is deleted when the query finishes. 
- 
CREATE TABLE AS table_function() query. It's one of the methods of creating a table. 
- 
INSERT INTO TABLE FUNCTION query. 
Note
You can’t use table functions if the allow_ddl setting is disabled.