Consider the following database table:PartNo Description CustID Name QuantityOrdered2361 Pens 7810 J. Smith 222371 Paper Clips 7810 J. Smith 10002914 Pens 7914 K. Jones 900If we were to delete the third row, all information about customer 7914 would be lost. Which of the following is this an example of?Select one:a.A deletion anomalyb.An update anomalyc.An insertion anomalyd.A modification anomal
Question
Consider the following database table:PartNo Description CustID Name QuantityOrdered2361 Pens 7810 J. Smith 222371 Paper Clips 7810 J. Smith 10002914 Pens 7914 K. Jones 900If we were to delete the third row, all information about customer 7914 would be lost. Which of the following is this an example of?Select one:a.A deletion anomalyb.An update anomalyc.An insertion anomalyd.A modification anomal
Solution
This is an example of a deletion anomaly.
In database terms, a deletion anomaly occurs when certain attributes are lost due to the deletion of other attributes. In this case, by deleting the third row, all information about customer 7914 (K. Jones) is lost, which is not desirable. This is because the table is not properly normalized, causing dependencies between unrelated data.
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