Introduction to SQL
NULL is

the same as 0 for integer
not a value
the same as blank for character
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 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.
A view is a database diagram.

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Introduction to SQL
Find the name of those cities with temperature and condition whose condition is either sunny or cloudy but temperature must be greater than 70oF.

SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' AND temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' AND condition = 'cloudy' OR temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' AND temperature > 70;
SELECT city, temperature, condition FROM weather WHERE condition = 'sunny' OR condition = 'cloudy' OR temperature > 70;

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