Given the following Staff2 table, please write a SQL statement to find the superno who supervised 4 or more sta The superno is the supervisor's staffno. staffno fname Iname position sex DOB ABC1 New Engineer Intern Super User M CC1 DBA M SA9 Mary Howe Assistant F SG14 David Ford Supervisor M Assistant F Manager IF Manager M Assistant F Assistant M SG37 Ann Beech SG5 Susan Brand SL21 John White SL41 Julie Lee XY1 New Tester salary branchno superno 9000 B002 SL21 SG14 1/1/2000 1/1/1995 90000 B005 2/19/1970 9000 B007 3/24/1958 18000 B003 11/10/1960 12000 B003 6/3/1940 24000 B003 10/1/1945 30000 B005 6/13/1965 9000 B005 1/1/1990 8000 B002 SG5 SG5 SG5 SL21 NULL SL21 SL21

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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.