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Introduction to SQL

Introduction to SQL
In SQL, which command is used to change a table's storage characteristics?

CHANGE TABLE
None of these
ALTER TABLE
MODIFY TABLE

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Introduction to SQL
Indexes may be created or dropped at any time.

True
False

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

TRUE
FLASE
Nothing
Hi

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

DELETE
ROLLBACK
TRUNCATE
COMMIT

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Introduction to SQL
The SQL WHERE clause:

limits the column data that are returned.
limits the row data are returned.
Neither A nor B are correct.
Both A and B are correct.

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Introduction to SQL
The qualifier DISTINCT must be used in an SQL statement when we want to eliminate duplicate rows.

True
False

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