Exam 6: Relational Databases and SQL

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A(n)______________________________ attribute is the attribute whose value is unique for every entity that will ever appear in the database.

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key

The following E-R diagram shows a M:N relationship between two relations.To map this E-R diagram into a logical database model: The following E-R diagram shows a M:N relationship between two relations.To map this E-R diagram into a logical database model:

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C

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

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False

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

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A set of data that describes a single instance of the entity represented by a relation is known as a tuple.

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The ______________________________ command is used to add new tuples to a relation.

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Refer to Exhibit 6-1.Which of the following SQL statements would extract the client number and date for every instance that had a billing rate of $150?

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The customer street address is often used as the key attribute in an REA diagram.

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A legacy system is one that has existed in an organization for less than one year.

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A primary attribute is the attribute whose value is unique for every entity that will appear in the database.

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

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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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Students at Macom University use a Web-based course registration system.Identify the participation constraint of the following data model relationship.The university maintains student records until they graduate or do not enroll in a course for a 3-year period. Students at Macom University use a Web-based course registration system.Identify the participation constraint of the following data model relationship.The university maintains student records until they graduate or do not enroll in a course for a 3-year period.

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The cardinality constraint:

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A(n)______________________________ in an accounting system can be classified as a resource,event,or agent about which data is collected.

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Which of following is not a step in the process for specifying relations based on REA diagrams?

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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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Business intelligence (BI)has been ranked as one of the top nine "key areas" of current developments in business information technology.

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The ______________________________ specifies the degree of minimum participation of one entity in the relationship with the other entity.

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

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