Exam 6: Relational Databases and Sql

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A set of data that describes an instance of the entity represented by a relation is known as a(n) ____.

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___________ values waste memory space and may cause problems when running queries.

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Most DBMS available today that include SQL also include mechanisms within the DBMS itself for establishing and enforcing referential integrity.

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Which of the following is the key attribute?

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A relation in an ER model is the same as an entity in the REA model.

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The constraint that is specifies the degree of minimum participation of one entity in the relationship with the other entity is called:

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SQL is a powerful database language that can be used to define database systems, query the database for information, generate reports from the database, and access databases from within programs using embedded commands.

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The SELECT statement has all but one of the following parts a.a list of attributes that we wish to SELECT from the database b.a WHEN clause c.a list of tables where these attributes can be found d.a WHERE clause

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Representing supervisors and their employees as separate entities in the model can lead to data redundancy.

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The ____________________ command is used when we want to change one or more attribute values for one or more tuples in a table.

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A collection of data representing multiple occurrences of a resource, event, or agent is known as a relation.

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For the following entity and attribute model, what would be the key attribute of the Students entity? For the following entity and attribute model, what would be the key attribute of the Students entity?

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A situation in which a particular supplier provides more than one type of inventory item to a firm and a particular type of inventory item is acquired from more than a single supplier is called a(n):

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In a relational database, the entity is represented as a(n):

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The cardinality constraint is used less frequently than the participation constraint.

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Customers of Hanson Company, a home furnishings wholesaler, place orders by contacting a sales representative via a toll-free number.Identify the constraints of the following data model relationship. Customers of Hanson Company, a home furnishings wholesaler, place orders by contacting a sales representative via a toll-free number.Identify the constraints of the following data model relationship.

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Attributes that consist of multiple subattributes are referred to as _________________________.

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The secondary key is specified to uniquely identity each tuple in the relation.

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____ are defined as a set of data that describes an instance of the entity represented by a relation.

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The mapping of the relationships between entities would be used in the development of a(n):

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