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themrmax 2017-10-14 01:36:59 +00:00 committed by GitHub
commit 985e198cb2

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@ -112,8 +112,8 @@ SELECT first_name
```sql
SELECT first_name AS fn
FROM staff AS s1
JOIN students AS s2
ON s2.mentor_id = s1.staff_num;
JOIN students AS s2
ON s2.mentor_id = s1.staff_num;
```
```sql
SELECT SUM(s.monitor_tally) AS monitor_total
@ -261,12 +261,12 @@ line where necessary.
SELECT r.last_name
FROM riders AS r
INNER JOIN bikes AS b
ON r.bike_vin_num = b.vin_num
AND b.engines > 2
ON r.bike_vin_num = b.vin_num
AND b.engines > 2
INNER JOIN crew AS c
ON r.crew_chief_last_name = c.last_name
AND c.chief = 'Y';
ON r.crew_chief_last_name = c.last_name
AND c.chief = 'Y';
```
#### Subqueries