Database System Concepts
7th Edition
ISBN: 9789332901384
Author: Henry F. Korth & S. Sudarshan Abraham Silberschatz
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Expert Solution & Answer
Chapter 13, Problem 2PE
Explanation of Solution
a.
System Structure after insertion:
| Header | ||||
| Record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| Record 1 | 24556 | Turnamian | Finance | 98000 |
| Record 2 | 15151 | Mozart | Music | 40000 |
| Record 3 | 22222 | Einstein | Physics | 95000 |
| Record 4 | ||||
| Record 5 | 33456 | Gold | Physics | 87000 |
| Record 6 | ... |
Explanation of Solution
b.
System Structure after deletion of record 2:
| Header | ||||
| Record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| Record 1 | 24556 | Turnamian | Finance | 98000 |
| Record 3 | 22222 | Einstein | Physics | 95000 |
| Record 4 | ||||
| Record 5 | 33456 | Gold | Physics | 87000 |
Explanation of Solution
c.
System Structure after insertion:
| Header | ||||
| Record 0 | 10101 | Srinivasan | Comp.Sci | 65000 |
| Record 1 | 24556 | Turnamian | Finance | 98000 |
| Record 2 | 34556 | Thompson | Music | 67000 |
| Record 3 | 22222 | Einstein | Physics | 95000 |
| Record 4 | ||||
| Record 5 | 33456 | Gold | Physics | 87000 |
| Record 6 | ... |
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How to develop a C program that receives the message sent by the provided program and displays the name and email included in the message on the screen?Here is the code of the program that sends the message for reference:
typedef struct { long tipo; struct { char nome[50]; char email[40]; } dados;} MsgStruct;
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9. Let L₁=L(ab*aa), L₂=L(a*bba*). Find a regular expression for (L₁ UL2)*L2.
10. Show that the language
is not regular.
L= {a":n≥1}
11. Show a derivation tree for the string aabbbb with the grammar
S→ABλ,
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L= {wna (w) < Nь (w) < Nc (w)}
is not context free.
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