| -- using default substitutions | |
| select | |
| 100.00 * sum(case | |
| when p_type like 'PROMO%' | |
| then l_extendedprice * (1 - l_discount) | |
| else 0 | |
| end) / sum(l_extendedprice * (1 - l_discount)) as promo_revenue | |
| from | |
| lineitem, | |
| part | |
| where | |
| l_partkey = p_partkey | |
| and l_shipdate >= date '1995-09-01' | |
| and l_shipdate < date '1995-09-01' + interval '1' month |