Another way to achieveabstractionin Java, is with interfaces. Aninterfaceis a completely "abstract class" that is used to group related methods with empty bodies: ExampleGet your own Java Server // interfaceinterfaceAnimal{publicvoidanimalSound();// interface method (does not have a body)public...
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First 2 paragraph of “https://www.w3schools.com/sql/sql_foreignkey.asp”. Page 2 of “https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a678d5ec-0d33-4d07-b44f-231ab4274e56/in-which-sequence-are-queries-and-subqueries-executed-by-the-sql-engine?forum=sqlgetstarted”. ...