Introduction to SQL
A subquery in an SQL SELECT statement:

can only be used with two tables.
cannot have its results sorted using ORDER BY.
can always be duplicated by a join.
has a distinct form that cannot be duplicated by a join.

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Introduction to SQL
The wildcard in a WHERE clause is useful when?

An exact match is necessary in a CREATE statement.
An exact match is not possible in a SELECT statement.
An exact match is necessary in a SELECT statement.
An exact match is not possible in a CREATE statement.

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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' OR 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' AND condition = 'cloudy' OR temperature > 70;

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