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deletion anomaly

deletion anomaly

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Which of the following will cause a deletion anomaly in the following table?

  1. Deleting surgery with surgeryNo S10.
  2. Deleting all appointments of Jill Bell.
  3. Deleting all appointments of Ian MacKay

A) 1 and 2

B) 1 and 3

C) 2 and 3

D) All three

staffNo dentistName patNo patName appointment date surgeryNo time Tony Smith Tony Smith Helen Pearson P108 S1011 P100 Gillian White | 12-Sep-13 10.00 S15 S1011 P105 Jill Bell 12-Sep-13 12.00 | S15 Ian MacKay 12-Sep-13 Ian MacKay 14-Sep-13 S1024 10.00 | S10 S1024 Helen Pearson P108 14.00 S10 S1032 Robin Plevin P105 Jill Bell 14-Sep-13 16.30 S15 S1032 Robin Plevin P110 John Walker 15-Sep-13 18.00 | S13
Transcribed Image Text:staffNo dentistName patNo patName appointment date surgeryNo time Tony Smith Tony Smith Helen Pearson P108 S1011 P100 Gillian White | 12-Sep-13 10.00 S15 S1011 P105 Jill Bell 12-Sep-13 12.00 | S15 Ian MacKay 12-Sep-13 Ian MacKay 14-Sep-13 S1024 10.00 | S10 S1024 Helen Pearson P108 14.00 S10 S1032 Robin Plevin P105 Jill Bell 14-Sep-13 16.30 S15 S1032 Robin Plevin P110 John Walker 15-Sep-13 18.00 | S13
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