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There are 3 types of Data Modification Anomalies:

Insertion Anomaly:

  • When one cannot insert a tuple into a relationship due to lack of data is called as Insertion Anomaly.

Deletion Anomaly:

  • When a deletion of data results in some un intended loss of important data, then it is referred to as Deletion Anomaly.

Update Anomaly:

  • When an single data value requires an update for multiple rows of data to be updated, it is referred to as update Anomaly.
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