If a piece of data (field value) is stored in two places in the database, then storage space

Storing data in two places in the same database can lead to wasted storage space and can cause data inconsistency. This is because when the data is updated in one location, the same change may not be applied to the other location, resulting in two different values for the same data. This inconsistency can lead to unexpected errors or results, making it difficult to maintain the integrity of the database. Also, the same data being stored in two locations can cause unnecessary use of storage space, making it more difficult to optimize the database.