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Creating Metadata types
) { switch (index) { case 0: return (K) Double.valueOf(this.trustValue); default: return null; } } Metadata must be combined, e.g. in a joinInteractive Data Stream Time Window Visualization (Interval Approach)
("elementsStart").innerHTML = "[" + elementsStartAt(observationPoint).join("]; [") + "]"; var allElementsInWindow = elementsInWindow(observationPointSelect syntax
FROM bid GROUP BY auction HAVING aprice<100.0 /// JOINS AND SELFJOINS #QUERY SELECT auction, bidder FROM bid, person WHERE bid.bidder = person.id #QUERY SELECTOdysseusRef.pdf
tests an existence predicate and can be used with the type EXISTS (semi join) and NOT_EXISTS (anti semi join). The predicates can be evaluated against the element from the first input and the second input. Semi join: All elements in the first input for which there are elements in the second input that fulfillsContinuous Query Language (CQL)
SELECT auction, AVG(price) AS aprice FROM bid GROUP BY auction HAVING aprice<100.0 /// JOINS AND SELFJOINS #QUERY SELECT auction, bidder FROM bid, person WHEREOdysseus_Tutorial.pdf
) • NEW_ELEMENT: the operator creates a new element (e.g. join) • Remark: In case of NEW_ELEMENT, meta data must be handled by the operator 92 iSTransferAreas