Which of the following query finds the name of the sailors who have reserved at least two boats?

Introduction to SQL
Which of the following query finds the name of the sailors who have reserved at least two boats?

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND COUNT(r1.bid) > r2.bid

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid <> r2.bid

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid ≠ r2.bid

All of these

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND COUNT(r1.bid) > r2.bid

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid <> r2.bid

SELECT DISTINCT s.sname FROM sailors s, reserves r1, reserves r2 WHERE s.sid = r1.sid AND r1.sid = r2.sid AND r1.bid ≠ r2.bid

All of these

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Introduction to SQL
Which of the following SQL commands is used to retrieve data?

DELETE

JOIN

INSERT

SELECT

DELETE

JOIN

INSERT

SELECT

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

ROLLBACK

DELETE

COMMIT

TRUNCATE

ROLLBACK

DELETE

COMMIT

TRUNCATE

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

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

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

SELECT city, temperature, humidity, country FROM location;

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

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

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

SELECT city, temperature, humidity, country FROM location;

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

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Introduction to SQL
To establish a range of values, < and > can be used.

False

True

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Introduction to SQL
The SQL statement: SELECT Name, COUNT(*) FROM NAME_TABLE; counts the number of name rows and displays this total in a table with a single row and a single column.

True

False

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Introduction to SQL

Introduction to SQL Which of the following query finds the name of the sailors who have reserved at least two boats?

Introduction to SQL Which of the following SQL commands is used to retrieve data?

Introduction to SQL Which command undo all the updates performed by the SQL in the transaction?

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

Introduction to SQL To establish a range of values, < and > can be used.

Introduction to SQL The SQL statement: SELECT Name, COUNT(*) FROM NAME_TABLE; counts the number of name rows and displays this total in a table with a single row and a single column.

Introduction to SQL
Which of the following query finds the name of the sailors who have reserved at least two boats?

Introduction to SQL
Which of the following SQL commands is used to retrieve data?

Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

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

Introduction to SQL
To establish a range of values, < and > can be used.

Introduction to SQL
The SQL statement: SELECT Name, COUNT(*) FROM NAME_TABLE; counts the number of name rows and displays this total in a table with a single row and a single column.