18. The following code is run on the sample data in the table people. What does the code do? Explaineach line and the results.START TRANSACTION;DELETE FROM people WHERE idSELECT COUNT (*) FROM people;2;ROLLBACK;SELECT COUNT (*) FROM people; CREATE TABLE people (id INT NOT NULL AUTO INCREMENT PRIMARY KEY,firstname VARCHAR(30), lastname VARCHAR(30), spouse_id INT,CONSTRAINT spouse fk FOREIGN KEY (spouse id) REFERENCES people (id));This is some sample data:+--| id | firstname | lastname | spouse_id |1 | Marty2 | Jennifer3 | Lorraine4 | Biff5 | George| McFly| Parker| McFly| Tannen| McFlyNULL |NULL |5 |NULL ||3 |

DELETE command will delete the row from people table where id=2. Hence, row 2 JENNIFER PARKER NULL…

Answered: line and the results T TRANSACTION; TE…

Engineering

Computer Science

line and the results T TRANSACTION; TE FROM people I CT COUNT(*) FROM ЗАСК;

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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Question

18. The following code is run on the sample data in the table people. What does the code do? Explain
each line and the results.
START TRANSACTION;
DELETE FROM people WHERE id
SELECT COUNT (*) FROM people;
2;
ROLLBACK;
SELECT COUNT (*) FROM people;

CREATE TABLE people (id INT NOT NULL AUTO INCREMENT PRIMARY KEY,
firstname VARCHAR(30), lastname VARCHAR(30), spouse_id INT,
CONSTRAINT spouse fk FOREIGN KEY (spouse id) REFERENCES people (id));
This is some sample data:
+--
| id | firstname | lastname | spouse_id |
1 | Marty
2 | Jennifer
3 | Lorraine
4 | Biff
5 | George
| McFly
| Parker
| McFly
| Tannen
| McFly
NULL |
NULL |
5 |
NULL |
|
3 |

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