We are excited to introduce our second guest author in this blog series, Xi He, assistant professor of Computer Science at the University of Waterloo, whose research represents the state of the art in the subject of this blog post: answering queries with joins while preserving differential privacy. – Joseph Near and David Darais So far in this blog series, we have discussed the challenges of ensuring differential privacy for queries over a single database table. In practice, however, databases are often organized into multiple tables, and queries over the data involve joins between these

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