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the INGRES algorithm (the detachment technique)

the INGRES algorithm (the detachment technique)

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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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%3std_absence.std_id AND std_absence.abs_hrs > 1 AND std_absence.date = '2020-12-06'; std_info I std_id ! std name i std_dpt I std_avg 1 | Ahmed 2 i Ali ! Information ! I Networks 75 80 : std_absence | std_id : std_name : date I abs_hrs! 1 ! Ahmed 2 I Ali 1 ! Ahmed | 2020-12-06 1 | 2020-12-06 | 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%3std_absence.std_id AND std_absence.abs_hrs > 1 AND std_absence.date = '2020-12-06'; std_info I std_id ! std name i std_dpt I std_avg 1 | Ahmed 2 i Ali ! Information ! I Networks 75 80 : std_absence | std_id : std_name : date I abs_hrs! 1 ! Ahmed 2 I Ali 1 ! Ahmed | 2020-12-06 1 | 2020-12-06 | 2020-12-08 I
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