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Max Flander 2017-10-14 12:36:21 +11:00
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@ -112,8 +112,8 @@ SELECT first_name
```sql ```sql
SELECT first_name AS fn SELECT first_name AS fn
FROM staff AS s1 FROM staff AS s1
JOIN students AS s2 JOIN students AS s2
ON s2.mentor_id = s1.staff_num; ON s2.mentor_id = s1.staff_num;
``` ```
```sql ```sql
SELECT SUM(s.monitor_tally) AS monitor_total SELECT SUM(s.monitor_tally) AS monitor_total
@ -261,12 +261,12 @@ line where necessary.
SELECT r.last_name SELECT r.last_name
FROM riders AS r FROM riders AS r
INNER JOIN bikes AS b INNER JOIN bikes AS b
ON r.bike_vin_num = b.vin_num ON r.bike_vin_num = b.vin_num
AND b.engines > 2 AND b.engines > 2
INNER JOIN crew AS c INNER JOIN crew AS c
ON r.crew_chief_last_name = c.last_name ON r.crew_chief_last_name = c.last_name
AND c.chief = 'Y'; AND c.chief = 'Y';
``` ```
#### Subqueries #### Subqueries