the INGRES algorithm (the detachment technique)

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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Apply the INGRES algorithm (the detachment technique) to the following query:
Select std_name,std_dpt
FROM std_info,std_absence
WHERE std_info.std_id%3Dstd_absence.std_id
AND std_absence.abs_hrs > 1
AND std_absence.date = '2020-12-06';
std_info
I std_id ! std_name ! std_dpt
I std_avg !
1 1 Ahmed
2 I Ali
! Information !
I Networks
75 1
80 :
std_absence
| std_id : std_name : date
I abs_hrs I
1 ! Ahmed
2 I Ali
1 1 Ahmed
| 2020-12-06 1
| 2020-12-06
I 2020-12-08 I
Transcribed Image Text:Apply the INGRES algorithm (the detachment technique) to the following query: Select std_name,std_dpt FROM std_info,std_absence WHERE std_info.std_id%3Dstd_absence.std_id AND std_absence.abs_hrs > 1 AND std_absence.date = '2020-12-06'; std_info I std_id ! std_name ! std_dpt I std_avg ! 1 1 Ahmed 2 I Ali ! Information ! I Networks 75 1 80 : std_absence | std_id : std_name : date I abs_hrs I 1 ! Ahmed 2 I Ali 1 1 Ahmed | 2020-12-06 1 | 2020-12-06 I 2020-12-08 I
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