Introduction to SQL
The SQL WHERE clause:

Both A and B are correct.
limits the column data that are returned.
Neither A nor B are correct.
limits the row data are returned.

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Introduction to SQL
Find the name of all cities with their temperature, humidity and countries.

SELECT weather.city, temperature, humidity FROM weather SELECT country FROM location WHERE weather.city = location.city;
SELECT weather.city, temperature, humidity, country FROM weather, location WHERE weather.city = location.city;
SELECT city, temperature, humidity, country FROM location;
SELECT weather.city, temperature, humidity, country FROM weather, location;

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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.
None of these
all records meeting the full criteria are to be returned.

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