There is an equivalent join expression that can be substituted for all subquery expressions.

Introduction to SQL
There is an equivalent join expression that can be substituted for all subquery expressions.

True

False

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Introduction to SQL
A subquery in an SQL SELECT statement:

has a distinct form that cannot be duplicated by a join.

cannot have its results sorted using ORDER BY.

can always be duplicated by a join.

can only be used with two tables.

has a distinct form that cannot be duplicated by a join.

cannot have its results sorted using ORDER BY.

can always be duplicated by a join.

can only be used with two tables.

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Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

True

False

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Introduction to SQL
Find all the cities with temperature, condition and humidity whose humidity is in the range of 63 to 79

SELECT * FROM weather WHERE humidity IN (63 to 79)

SELECT * FROM weather WHERE humidity NOT BETWEEN 63 AND 79

SELECT * FROM weather WHERE humidity BETWEEN 63 AND 79

SELECT * FROM weather WHERE humidity NOT IN (63 AND 79)

SELECT * FROM weather WHERE humidity IN (63 to 79)

SELECT * FROM weather WHERE humidity NOT BETWEEN 63 AND 79

SELECT * FROM weather WHERE humidity BETWEEN 63 AND 79

SELECT * FROM weather WHERE humidity NOT IN (63 AND 79)

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Introduction to SQL
Which of the following query finds the names of the sailors who have reserved at least one boat?

SELECT DISTINCT s.sname FROM sailors, reserves WHERE s.sid = r.sid;

SELECT DISTINCT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

SELECT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

None of These

SELECT DISTINCT s.sname FROM sailors, reserves WHERE s.sid = r.sid;

SELECT DISTINCT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

SELECT s.sname FROM sailors s, reserves r WHERE s.sid = r.sid;

None of These

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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.

False

True

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Introduction to SQL

Introduction to SQL There is an equivalent join expression that can be substituted for all subquery expressions.

Introduction to SQL A subquery in an SQL SELECT statement:

Introduction to SQL SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

Introduction to SQL Find all the cities with temperature, condition and humidity whose humidity is in the range of 63 to 79

Introduction to SQL Which of the following query finds the names of the sailors who have reserved at least one boat?

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
There is an equivalent join expression that can be substituted for all subquery expressions.

Introduction to SQL
A subquery in an SQL SELECT statement:

Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

Introduction to SQL
Find all the cities with temperature, condition and humidity whose humidity is in the range of 63 to 79

Introduction to SQL
Which of the following query finds the names of the sailors who have reserved at least one boat?

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.