What is abstract class. The difference between abstract class and interface. What is delegate. Define public, private, protect.... The difference between overriding and overloading.
For the SQL part, asked about primary key, unique key, foreign key, left join, inner join. The difference between join and join all. The difference between COUNT() and COUNT(*).

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What is abstract class. The difference between abstract class and interface. What is delegate. Define public, private, protect.... The difference between overriding and overloading. 
For the SQL part, asked about primary key, unique key, foreign key, left join, inner join. The difference between join and join all. The difference between COUNT() and COUNT(*).

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