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Introduction to SQL

Introduction to SQL
The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows.

True
False

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Introduction to SQL
The SQL keyword BETWEEN is used:

as a wildcard.
to limit the columns displayed.
for ranges.
None of these

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Introduction to SQL
Most companies keep at least two versions of any database they are using.

False
True

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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
'AS' clause is used in SQL for

Projection operation.
Selection operation.
Join operation.
Rename operation.

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Introduction to SQL
Find all the cities whose humidity is 89

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

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