Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Concept explainers

Single Table
In a database management system, a single table is designed to obtain data of heterogeneous items. A single-table design with DynamoDB resolves the issue of raising multiple requests for the relevant data of an entity.
Question
Given the following Staff2 table, please write a SQL statement to find the superno who supervised 4 or more staff. The superno is the supervisor's staffno. staffno fname Iname position ABC1 New Engineer Intern CC1 Super User DBA SA9 Mary Howe SG14 David Ford SG37 Ann Beech SG5 Susan Brand SL21 John White SL41 Julie Lee XY1 New Tester Forth sex DOB M M Assistant F Supervisor M Assistant F Manager F Manager M Assistant F Assistant M salary branchno superno 1/1/2000 9000 B002 SL21 1/1/1995 90000 B005 SG14 2/19/1970 9000 B007 SG5 3/24/1958 18000 B003 SG5 11/10/1960 12000 B003 SG5 6/3/1940 24000 B003 SL21 10/1/1945 30000 B005 NULL 6/13/1965 9000 B005 SL21 1/1/1990 8000 B002 SL21
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Transcribed Image Text:Given the following Staff2 table, please write a SQL statement to find the superno who supervised 4 or more staff. The superno is the supervisor's staffno. staffno fname Iname position ABC1 New Engineer Intern CC1 Super User DBA SA9 Mary Howe SG14 David Ford SG37 Ann Beech SG5 Susan Brand SL21 John White SL41 Julie Lee XY1 New Tester Forth sex DOB M M Assistant F Supervisor M Assistant F Manager F Manager M Assistant F Assistant M salary branchno superno 1/1/2000 9000 B002 SL21 1/1/1995 90000 B005 SG14 2/19/1970 9000 B007 SG5 3/24/1958 18000 B003 SG5 11/10/1960 12000 B003 SG5 6/3/1940 24000 B003 SL21 10/1/1945 30000 B005 NULL 6/13/1965 9000 B005 SL21 1/1/1990 8000 B002 SL21
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