Exam 6: Relational Databases and Sql

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A missing value is called a non-null.

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The INSERT command is used to add a single tuple to an existing relation.

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The UPDATE command demonstrates one of the weaknesses in most forms of SQL.

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The cardinality constraint is used to specify both the minimum and maximum participation of one entity in the relationship with the other entity.

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____ specifies that for every attribute value in one relation that has been specified in order to allow reference to another relation,the tuple being referenced must remain intact.

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A recursive relationship occurs between two different instances of an entity.

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A model is a complex representation of a simple entity or phenomenon.

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A collection of data representing multiple occurrences of a resource, event, or agent is known as a(n) ____________________.

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Which of the following is a composite attribute?

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A(n) ______________________________ relationship occurs between two different instances of an entity.

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Which of the following SQL statements would extract the employee number and date for every instance that had a billing rate of $150?

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Relational integrity specifies that for every attribute in one relation that has been specified to allow reference to another relation, the tuple being referenced must remain intact.

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Which of the following is a valid SQL command?

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