Introduction to SQL
What is a view?

A view is a database diagram.
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.
A view is a special stored procedure executed when certain event occurs.
None of these

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Introduction to SQL
In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:

all columns of the table are to be returned.
all records with even partial criteria met are to be returned.
all records meeting the full criteria are to be returned.
None of these

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Introduction to SQL
NULL is

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

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