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Introduction to SQL

Introduction to SQL
Each index consumes extra storage space and also requires overhead maintenance time whenever indexed data change value.

False
True

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

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

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Introduction to SQL
Indexes can usually be created for both primary and secondary keys.

False
True

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Introduction to SQL
Which one of the following sorts rows in SQL?

GROUP BY
SORT BY
ORDER BY
ALIGN BY

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

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

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Introduction to SQL
The SQL statement that queries or reads data from a table is ________ .

SELECT
None of these
READ
QUERY

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