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Flow Variables and Components

02 Flow Variables and Components - Exercise (Solution)

This workflow shows a solution to a hands-on exercise in the L2-DW Introduction to KNIME Analytics Platform for Data Wranglers - Advanced course

Task 1: Use Flow VariablesRead the JoinedCountryTable.table file by executing the Table Reader node. This table containsinformation about the demographics, geolocation, and travel risks in the different countries/territoriesin 2020. Your task is to find the northmost country/territory in the data via the following steps:1. Calculate first the maximum latitude value in the data2. Transform it into a flow variable3. Filter the data by this flow variable Task 2: Create a ComponentsExecute the provided workflow. It filters the data to the northmost country or territory in the data. Yourtask is to extend it into a component that returns the northmost country/region by continent via thefollowing steps:1. Create a Value Selection Configuration node to select one of the UN continental regions in the data2. Add a Row Filter node before the GroupBy node to filter the data by the selected continent3. Encapsulate the workflow into a component. Make sure you add a data output to the component. Task 3: Use a Shared ComponentYour task is to compare how fast/slow the population increases in different countries. Build achoropleth world map via the following steps:1. Drag and drop the Choropleth World Map shared component from the KNIME Hub2. Select the Country/Territory and Change (population) columns in its configuration dialog3. Open the component’s interactive view JoinedCountryData.tableMaximum latitudeFilter to the northmost countryor territoryLife expectancy bycountries Table Reader GroupBy Rule-basedRow Filter Table Rowto Variable Northmost countryby continent ChoroplethWorld Map Task 1: Use Flow VariablesRead the JoinedCountryTable.table file by executing the Table Reader node. This table containsinformation about the demographics, geolocation, and travel risks in the different countries/territoriesin 2020. Your task is to find the northmost country/territory in the data via the following steps:1. Calculate first the maximum latitude value in the data2. Transform it into a flow variable3. Filter the data by this flow variable Task 2: Create a ComponentsExecute the provided workflow. It filters the data to the northmost country or territory in the data. Yourtask is to extend it into a component that returns the northmost country/region by continent via thefollowing steps:1. Create a Value Selection Configuration node to select one of the UN continental regions in the data2. Add a Row Filter node before the GroupBy node to filter the data by the selected continent3. Encapsulate the workflow into a component. Make sure you add a data output to the component. Task 3: Use a Shared ComponentYour task is to compare how fast/slow the population increases in different countries. Build achoropleth world map via the following steps:1. Drag and drop the Choropleth World Map shared component from the KNIME Hub2. Select the Country/Territory and Change (population) columns in its configuration dialog3. Open the component’s interactive view JoinedCountryData.tableMaximum latitudeFilter to the northmost countryor territoryLife expectancy bycountriesTable Reader GroupBy Rule-basedRow Filter Table Rowto Variable Northmost countryby continent ChoroplethWorld Map

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To use this workflow in KNIME, download it from the below URL and open it in KNIME:

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Created by: Maarit Laukkanen
Created at: 2020-10-23
On NodePit since: 2023-02-12
Last update: 2024-11-17
Created with KNIME version: v4.7.0
Tags: education

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