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Introduction to SQL

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

LEFT
AVG
LEN
JOIN

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Introduction to SQL
A subquery in an SQL SELECT statement is enclosed in:

brackets -- [...].
CAPITAL LETTERS.
braces -- {...}.
parenthesis -- (...) .

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Introduction to SQL
The keyword LIKE can be used in a WHERE clause to refer to a range of values.

True
False

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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
Count function in SQL returns the number of

values.
columns.
groups.
distinct values.

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Introduction to SQL
Which of the following do you need to consider when you make a table in SQL?

Default values
All of these
Primary keys
Data types

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