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Introduction to Database System

Introduction to Database System
In a relation, the order of the rows matters.

True
False

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Introduction to Database System
A minimum cardinality is the minimum number of entity instances that may participate in a relationship instance.

False
True

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Introduction to Database System
In SQL, which command is used to add new rows to a table?

APPEND
ADD ROW
ALTER TABLE
INSERT

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Introduction to Database System
In SQL, which command is used to changes data in a table?

UPDATE
INSERT
APPEND
BROWSE

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Introduction to Database System
A primary key is a composite key that was selected to be the main identifier for the relation.

True
False

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Introduction to Database System
A key:

must always be composed of two or more columns.
can only be one column.
identifies a row.
identifies a column.

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