Introduction to SQL
What is the meaning of LIKE '%0%0%'

Feature has two 0's in it, at any position
Feature has more than two 0's
Feature begins with two 0's
Feature ends with two 0's

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Introduction to SQL
What does the following query find?(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'red')MINUS(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'green')

Find the sailor IDs of at least one sailor who have reserved red boats but not green boats
None of These
Find the sailor IDs of all sailors who have reserved red boats but not green boats
Find the sailor Ids of atmost one sailor who have reserved red boats but not green boats

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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:

None of these
all records with even partial criteria met are to be returned.
all records meeting the full criteria are to be returned.
all columns of the table are to be 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 weather.city, temperature, humidity, country FROM weather, location;
SELECT city, temperature, humidity, country FROM location;

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