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Introduction to SQL

Introduction to SQL
Which SQL statement is used to delete data FROM a database?

COLLAPSE
ALTER
DELETE
REMOVE

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Introduction to SQL
SQL provides five built-in functions: COUNT, SUM, AVG, MAX, MIN.

True
False

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Introduction to SQL
Which of the following must be enclosed in double quotes?

All of these
Strings
Dates
Column Alias

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Introduction to SQL
Which of the following SQL commands is used to retrieve data?

INSERT
SELECT
JOIN
DELETE

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Introduction to SQL
A subquery in an SQL SELECT statement:

can always be duplicated by a join.
can only be used with two tables.
cannot have its results sorted using ORDER BY.
has a distinct form that cannot be duplicated by a join.

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Introduction to SQL
SELECT DISTINCT is used if a user wishes to see duplicate columns in a query.

True
False

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