Database System Concepts
7th Edition
ISBN: 9781260084504
Author: Abraham Silberschatz, S. Sudarshan, Abraham, Henry Korth, Silberschatz Abraham, Silberschatz Professor
Publisher: McGraw-Hill Education
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Expert Solution & Answer
Chapter 14, Problem 13PE
Explanation of Solution
Given scenario:
- In the given case, there are 12 rows. Bitmap indexing is done on the salary ranges.
- Below 50000(B1)
- to below 60000(B2)
- to below 70000(B3)
- and above (B4)
- Therefore, there will be 4 rows of each for each range. Each row has 12 columns. Bitmap will have the value 1 for a row in the relation if the salary is under that range.
- Only third row (salary 40000 i.e., below 50000) in the relation satisfies the salary range of B1...
Explanation of Solution
b. Select query is:
- Select * from instructor where department=finance and salary>=80000
- Therefore, two bit maps are required for this query. One should be on department and another on salary.
- Bitmap on department(7 departments):
| Comp. | 100000100010 |
| Finance | 010000001000 |
| Music | 001000000000 |
| Physics | 000101000000 |
| History | 000010010000 |
| Biology | 000000000100 |
| Elec. Eng... |
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