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$exists and non-sparse indexes in MongoDB and in other DocumentDB

In SQL databases, NULL represents an unknown value — not the absence of a value. When a value is simply non-applicable for a given entity, the correct relational modeling approach is normalization: the entity gets no row in the relevant table at all, rather than a NULL in a column. This distinction

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$exists and non-sparse indexes in MongoDB and in other DocumentDB

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$exists and non-sparse indexes in MongoDB and in other DocumentDB

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