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In an E-R diagram, a(n) ________ on a line means that at least one entity of that type is required.


A) small oval
B) vertical bar
C) arrow
D) triangular block

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State the purposes of the four elements of a database application.

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The specific purposes of the four elemen...

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In an E-R diagram, a line between two entities represents a(n) ________.


A) attribute
B) identifier
C) cardinality
D) relationship

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