Data integration is one of the key challenges in many IT projects and it is estimated that data scientists spend about 80% of their time on data integration and cleansing. In the enterprise context, data integration techniques are applied whenever data from separate sources needs to be combined for new applications or data analysis projects. Within the context of the Web, data integration lays the foundation for taking advantage of the ever growing number of publicly-accessible data sources and enables applications such as product comparison portals, job portals, or data search engines.
In the course, students will learn and experiment with techniques for integrating and cleansing data from large sets of heterogeneous data sources. The course will cover the following topics:
Heterogeneity and Distributedness
The Data Integration Process
Structured Data on the Web
Data Exchange Formats
Schema Mapping and Data Translation
Data Quality Assessment
The course consists of a lecture as well as accompanying practical projects. The lecture (IE670) covers the theory and methods of web data integration and is concluded by a written exam (3 ECTS). In the projects (IE683), students will gain experience with web data integration methods by applying them within a real-world use case of their choise. Students will work on their projects in teams and will report the results of their projects in the form of a written report as well as an oral presentation (together 3 ECTS). While the lecture and the project can be attended in seperate years, it is highly recommended to attend both in the same semester as the schedule of the lecture and project are aligned to each other.
The course will take place in three different formats: hybrid (offline + online), online and video.
Please consult the outline for further information about how the sessions will take place.
Sessions set in bold will take place live in the lecture hall B6 A101 and on Zoom [hybrid] or only on Zoom [online]. For the other sessions, we will provide video recordings.
|8.9.2021||Lecture[hybrid]: Introduction to Web Data Integration||Lecture: Structured Data on the Web|
|15.9.2021||Lecture: Data Exchange Formats||Q&A [hybrid]:Data Exchange Formats|
Exercise: Data Exchange Formats
|22.9.2021||Lecture: Schema Mapping||Q&A [hybrid]: Schema Mapping|
|29.9.2021||Project [hybrid]: Introduction to Student Projects||Project: Preparation of Project Outlines|
|6.10.2021||Project [online]: Feedback about Project Outlines||Exercise [hybrid]: Introduction to MapForce|
|13.10.2021||Coaching [online]: Schema Mapping||Lecture: Identity Resolution|
|20.10.2021||Lecture: Identity Resolution||Q&A [hybrid]: Identity Resolution|
|27.10.2021||Exercise [hybrid]: Identity Resolution||Project Work: Identity Resolution|
|3.11.2021||Coaching [online]: Identity Resolution||Project Work: Identity Resolution|
|10.11.2021||Lecture: Data Quality and Data Fusion||Lecture: Data Quality and Data Fusion|
|17.11.2021||Q&A [hybrid]: Data Quality and Data Fusion||Exercise [hybrid]: Data Quality and Data Fusion|
|24.11.2021||Project Work: Data Quality and Fusion||Coaching [online]: Data Quality and Fusion|
|1.12.2021||Project Work: Data Quality and Fusion||Coaching [online]: Data Quality and Fusion|
|8.12.2021||Presentation of Project Results [hybrid]||Presentation of Project Results [hybrid]|
Exercise 1: Data Exchange Formats
Exercise 2: Schema Mapping (Link to Tutorial Video | Solutions)
Exercise 3: Identity Resolution (Link to Tutorial Video | Solutions)
Exercice 4: Data Fusion (Link to Tutorial Video | Solutions)
AnHai Doan, Alon Halevy, Zachary Ives: Principles of Data Integration. Morgan Kaufmann, 2012.
Luna Dong, Divesh Srivastava: Big Data Integration. Morgan & Claypool, 2015.
Ulf Leser, Felix Naumann: Informationsintegration. Dpunkt Verlag, 2007. (Free PDF Version)
Peter Christen: Data Matching – Concepts and Techniques for Record Linkage, Entity Resolution, and Duplicate Detection. Springer, 2012.