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Introduction to SQL

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

True
False

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Introduction to SQL
The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs

Nothing
Hi
TRUE
FLASE

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

DIFFERENT
DISTINCTIVE
UNIQUE
DISTINCT

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Introduction to SQL
The SQL keyword GROUP BY instructs the DBMS to group together those rows that have the same value in a column.

True
False

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Introduction to SQL
The SQL keyword BETWEEN is used:

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

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Introduction to SQL
A SELECT statement within another SELECT statement and enclosed in square brackets ([...]) is called a subquery.

True
False

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