EBK DATABASE SYSTEM CONCEPTS
7th Edition
ISBN: 9781260049268
Author: SILBERSCHATZ
Publisher: MCG COURSE
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Expert Solution & Answer
Chapter 5, Problem 24E
Explanation of Solution
Given relation “r”:
The given relation “r” is shown in the below table,
| building | room_number | time_slot_id | course_id | sec_id |
| Garfield | 359 | A | BIO-101 | 1 |
| Garfield | 359 | B | BIO-101 | 2 |
| Saucon | 651 | A | CS-101 | 2 |
| Saucon | 550 | C | CS-319 | 1 |
| Painter | 705 | D | MU-199 | 1 |
| Painter | 403 | D | FIN-201 | 1 |
Given query:
The given query is,
select building, room_number, time_slot_id, count(*)
from r
group by rollup (building, room_number, time_slot_id)
Result:
The result of the given query is,
| building | room_number | time_slot_id | count(*) |
| Garfield | 359 | A | 1 |
| Garfield | 359 | B | 1 |
| Garfield | 359 |
Expert Solution & Answer
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