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43. which of the following is a true statement? a. attribute a derives from attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b. b. attribute a determines attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b. c. attribute s owns attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b. d. attribute s controls attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b.

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mary24457181

This is a true statement because if all of the rows in the table that agree in value for attribute a also agree in value for attribute b, then attribute a is said to derive from attribute b.

  • a. Attribute a derives from attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b.

The Derivation of Attributes

Attribute a derives from attribute b if all of the rows in the table that agree in value for attribute a also agree in value for attribute b. In other words, if attribute a is present in every row that attribute b is present in, then attribute a is said to derive from attribute b. This relationship between attributes is important to consider when designing a database, as it can help to ensure data integrity and avoid problems down the line.

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