tasks/readable/018/task_readable.md

Task: 018

Database: retails

Question

Count the number of customers that have used air shipping.

Gold Query

SELECT COUNT(DISTINCT c.c_custkey)
FROM customer c
JOIN orders o ON c.c_custkey = o.o_custkey
JOIN lineitem l ON o.o_orderkey = l.l_orderkey
WHERE l.l_shipmode IN ('AIR', 'REG AIR');

Execution Result:

COUNT(DISTINCT c.c_custkey)
92006

1 rows