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Introduction to SQL

Introduction to SQL
To remove duplicate rows from the results of an SQL SELECT statement, the ________ qualifier specified must be included.

DISTINCT
UNIQUE
ONLY
SINGLE

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Introduction to SQL
Indexes can usually be created for both primary and secondary keys.

True
False

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Introduction to SQL
The SELECT command, with its various clauses, allows users to query the data contained in the tables and ask many different questions or ad hoc queries.

False
True

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Introduction to SQL
In SQL, which command is used to change a table's storage characteristics?

None of these
ALTER TABLE
MODIFY TABLE
CHANGE TABLE

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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 > ALL (SELECT SALARY FROM EMPLOYEE);prints

0
5
10
9

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Introduction to SQL
A subquery in an SQL SELECT statement:

can always be duplicated by a join.
cannot have its results sorted using ORDER BY.
can only be used with two tables.
has a distinct form that cannot be duplicated by a join.

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