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Introduction to SQL

Introduction to SQL
Which of the following is valid SQL for an Index?

ADD INDEX ID;
REMOVE INDEX ID;
CREATE INDEX ID;
CHANGE INDEX ID;

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Introduction to SQL
Which command undo all the updates performed by the SQL in the transaction?

ROLLBACK
COMMIT
DELETE
TRUNCATE

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Introduction to SQL
Which of the following is a valid SQL type?

CHARACTER
All of these
FLOAT
NUMERIC

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Introduction to SQL
A subquery in an SQL SELECT statement:

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

False
True

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Introduction to SQL
The result of a SQL SELECT statement is a(n) ________ .

file
report
form
table

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