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

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

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;

None of These

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

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;

None of These

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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):

LIKE only.

IN only.

Both IN and NOT IN.

NOT IN only.

LIKE only.

IN only.

Both IN and NOT IN.

NOT IN only.

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Introduction to SQL
Which of the SQL statements is correct?

SELECT Username, Password FROM Users

SELECT Username, Password WHERE Username = 'user1'

SELECT Username AND Password FROM Users

None of these

SELECT Username, Password FROM Users

SELECT Username, Password WHERE Username = 'user1'

SELECT Username AND Password FROM Users

None of these

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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 manipulation language

All of these

To specify the syntax and semantics of SQL data definition language

To define the data structures

To specify the syntax and semantics of SQL manipulation language

All of these

To specify the syntax and semantics of SQL data definition language

To define the data structures

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Introduction to SQL
Table Employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM Employee WHERE SALARY > ANY (SELECT SALARY FROM EMPLOYEE);prints

5

0

10

9

5

0

10

9

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

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 SQL statements is correct?

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

Introduction to SQL Table Employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM Employee WHERE SALARY > ANY (SELECT SALARY FROM EMPLOYEE);prints

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

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

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 SQL statements is correct?

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

Introduction to SQL
Table Employee has 10 records. It has a non-NULL SALARY column which is also UNIQUE.The SQL statementSELECT COUNT(*) FROM Employee WHERE SALARY > ANY (SELECT SALARY FROM EMPLOYEE);prints