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Introduction to SQL

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

FLASE
TRUE
Nothing
Hi

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Introduction to SQL
Which of the following is the correct order of keywords for SQL SELECT statements?

SELECT, FROM, WHERE
FROM, WHERE, SELECT
SELECT,WHERE,FROM
WHERE, FROM,SELECT

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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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Introduction to SQL
Which of the following is a SQL aggregate function?

AVG
JOIN
LEFT
LEN

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Introduction to SQL
The SQL keyword(s) ________ is used with wildcards.

NOT IN only
IN only
IN and NOT IN
LIKE only

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

DIFFERENT
DISTINCT
DISTINCTIVE
UNIQUE

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