What is the ROLLUP extension to the GROUP BY clause? Provide the syntax for this extension. code example

Example: cube oracle

-- the CUBE extension will generate subtotals for all combinations of the 
 -- dimensions specified. If "n" is the number of columns listed in the CUBE,
 -- there will be 2^n subtotal combinations.
 
 SELECT fact_1_id,
       fact_2_id,
       fact_3_id,
       SUM(sales_value) AS sales_value
FROM   dimension_tab
GROUP BY CUBE (fact_1_id, fact_2_id, fact_3_id)
ORDER BY fact_1_id, fact_2_id, fact_3_id;