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

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

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Introduction to SQL
Find the names of the countries whose condition is sunny.

SELECT country FROM location WHERE city NOT IN (SELECT city FROM weather WHERE condition = 'sunny');
SELECT country FROM location WHERE condition = 'sunny';
SELECT country FROM location WHERE city IN (SELECT city FROM weather WHERE condition = sunny');
SELECT country FROM location WHERE city UNION (SELECT city FROM weather WHERE condition = 'sunny');

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Introduction to SQL
A view is which of the following?

A virtual table that cannot be accessed via SQL commands
A base table that can be accessed via SQL commands
A virtual table that can be accessed via SQL commands
A base table that cannot be accessed via SQL commands

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