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Introduction to SQL

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

All of these
ALTER TABLE
CHANGE TABLE
MODIFY TABLE

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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.

False
True

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Introduction to SQL
Which SQL keyword is used to retrieve only unique values?

DISTINCTIVE
DIFFERENT
DISTINCT
UNIQUE

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Introduction to SQL
Find all the cities whose humidity is 89

SELECT city FROM weather;
SELECT city WHERE humidity = 89;
SELECT humidity = 89 FROM weather;
SELECT city FROM weather WHERE humidity = 89;

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Introduction to SQL
DISTINCT and its counterpart, ALL, can be used more than once in a SELECT statement.

False
True

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Introduction to SQL
Indexes may be created or dropped at any time.

False
True

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