What's the difference between interface and abstract class?
What's @ 's function in SQL?
Write a SQL statement.
What's difference between Overload and override.
Name all types of the access Modifiers.
In SQL, what's Union and UnionAll ?

Question

What's the difference between interface and abstract class?
What's @ 's function in SQL?
Write a SQL statement.
What's difference between Overload and override.
Name all types of the access Modifiers. 
In SQL, what's Union and UnionAll ?

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