The most efficient tables in a relational database in terms of storage space have no redundant data and very few null values because the presence of these suggest that space is being wasted, and more data to store means higher data storage hardware costs.

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Tables without redundant data and with very few null values are more efficient in terms of storage space. Redundant data and null values indicate that space is being wasted and can result in higher data storage costs.

The Most Efficient Tables in a Relational Database in Terms