# Task: 018

**Database:** retails  

## Question
Count the number of customers that have used air shipping.


## Gold Query

```sql
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*