Determine the difference in days between the first start time of a class and the last start time for a course when the course has more than one section (18 rows).

What will be an ideal response?

```
SELECT MAX(start_date_time) - MIN(start_date_time),
course_no, COUNT(course_no)
FROM section
GROUP BY course_no
HAVING COUNT(course_no) >1
```

Computer Science & Information Technology

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Explain what is meant when a placed file's status is listed as Missing.

What will be an ideal response?

Computer Science & Information Technology