A sparse column is another tool used to reduce the amount of
physical storage used in a database. They are the ordinary columns that have an
optimized storage for null values. Sparse columns reduce the space requirements
for null values at the cost of more overhead to retrieve nonnull values.
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A sparse column is another tool used to reduce the amount of physical storage used in a database. They are the ordinary columns that have an optimized storage for null values. Sparse columns reduce the space requirements for null values at the cost of more overhead to retrieve nonnull values.