Today I came to know a new concept in DB - Continuous Query. Traditionally, one query is run once over the current dataset and it is completed. Continuous query, in contrast, logically runs continuously over the database. Possible application of this type of query may be in Stock market, Traffic monitor etc.
Reference:
Shivnath Babu, Jennifer Widom, Continuous queries over data streams. http://ilpubs.stanford.edu:8090/527/1/2001-9.pdf
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