What operator tests column for the absence of data?

Introduction to SQL
What operator tests column for the absence of data?

NOT operator

EXISTS operator

None of these

IS NULL operator

NOT operator

EXISTS operator

None of these

IS NULL operator

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Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

NOT IN only.

IN only.

LIKE only.

Both IN and NOT IN.

NOT IN only.

IN only.

LIKE only.

Both IN and NOT IN.

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Introduction to SQL
Which of the following is the original purpose of SQL?

To specify the syntax and semantics of SQL data definition language

All of these

To specify the syntax and semantics of SQL manipulation language

To define the data structures

To specify the syntax and semantics of SQL data definition language

All of these

To specify the syntax and semantics of SQL manipulation language

To define the data structures

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Introduction to SQL
Which of the following query finds colors of boats reserved by "Dustin"?

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND r.bid = b.bid

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid AND r.bid = b.bid;

SELECT DISTINCT b.color FROM boats b, sailors s WHERE s.sname = 'Dustin' AND s.sid = b.sid

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND r.bid = b.bid

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid AND r.bid = b.bid;

SELECT DISTINCT b.color FROM boats b, sailors s WHERE s.sname = 'Dustin' AND s.sid = b.sid

SELECT DISTINCT b.color FROM boats b, reserves r, sailors s WHERE s.sname = 'Dustin' AND s.sid = r.sid

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

False

True

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Introduction to SQL
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.

True

False

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Introduction to SQL

Introduction to SQL What operator tests column for the absence of data?

Introduction to SQL When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

Introduction to SQL Which of the following is the original purpose of SQL?

Introduction to SQL Which of the following query finds colors of boats reserved by "Dustin"?

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

Introduction to SQL Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.

Introduction to SQL
What operator tests column for the absence of data?

Introduction to SQL
When three or more AND and OR conditions are combined, it is easier to use the SQL keyword(s):

Introduction to SQL
Which of the following is the original purpose of SQL?

Introduction to SQL
Which of the following query finds colors of boats reserved by "Dustin"?

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

Introduction to SQL
Data manipulation language (DML) commands are used to define a database, including creating, altering, and dropping tables and establishing constraints.