Introduction to SQL
NULL is

the same as blank for character
not a value
the same as 0 for integer
the same as 0 for integer and blank for character

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Introduction to SQL
What is a view?

None of these
A view is a database diagram.
A view is a special stored procedure executed when certain event occurs.
A view is a virtual table which results of executing a pre-compiled query. A view is not part of the physical database schema, while the regular tables are.

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