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Any one knows what is "query containment" and where do we use it please? As far as I can search on Google, I only found one here.

Although, I've got some idea on the subject but I'm finding it difficult to understand the use case of it.

Many thanks,

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The linked paper has a definition:

In the relational model, a query Q1 is said to be contained in the query Q2 if Q1 produces a subset of the answers of Q2, for any given database.

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