(1)Data Integration ●Data integration Integrating data from multiple data sources into a consistent store center Pattern/Mode/Structure integration Integrate metadata of different data sources Entity identification problem:match different real- world entities from multiple data sources. .E.g.A.cust-id=B.customer no Semantic integration problem 10 DATA Copyright 2019 by Xiaoyu Li.Copyright © 2019 by Xiaoyu Li. 10 (1) Data Integration  Data integration  Integrating data from multiple data sources into a consistent store center  Pattern/Mode/Structure integration  Integrate metadata of different data sources  Entity identification problem: match different real￾world entities from multiple data sources.  E.g. A.cust-id=B.customer_no  Semantic integration problem