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

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

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

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Introduction to SQL
Find the temperature in increasing order of all cities

SELECT city, temperature FROM weather;
SELECT city, temperature FROM weather ORDER BY temperature;
SELECT city, temperature FROM weather ORDER BY city;
SELECT city FROM weather ORDER BY temperature;

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