Сводные таблицы (LibreOffice Calc)

This video shows the basics of pivot tables in spreadsheets, selection of classifying fields and aggregation functions, creation of helper classifying fields. As an example pivot tables with one, two and multiple classifying fields are created from an earthquake information table. Earthquake information is from http://seismicportal.eu/. The free software LibreOffice Calc 5 is being used for demonstration (http://www.libreoffice.org/).