roll up oracle

1-- In addition to the regular aggregation results we expect from the
2-- GROUP BY clause, the ROLLUP extension produces group subtotals from 
3-- right to left and a grand total. If "n" is the number of 
4-- columns listed in the ROLLUP, there will be n+1 levels of subtotals.
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6SELECT fact_1_id,
7       fact_2_id,
8       fact_3_id,
9       SUM(sales_value) AS sales_value
10FROM   dimension_tab
11GROUP BY ROLLUP (fact_1_id, fact_2_id, fact_3_id)
12ORDER BY fact_1_id, fact_2_id, fact_3_id;
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