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02 Flow Variables and Components

02 Flow Variables and Components - Exercise

This workflow shows 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 ComponentsYour task is to extend the workflow from the previous task into a component that returns the northmostcountry/region by continent via the following 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.tablemax latitudetransform to flow variablefiltered to flow variableLife expectancy map Table Reader GroupBy Table Rowto Variable Row Filter Continent Selection 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 ComponentsYour task is to extend the workflow from the previous task into a component that returns the northmostcountry/region by continent via the following 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.tablemax latitudetransform to flow variablefiltered to flow variableLife expectancy mapTable Reader GroupBy Table Rowto Variable Row Filter Continent Selection 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: 2023-02-14
Last update: 2024-11-21
Created with KNIME version: v4.7.0
Tags: educationself-pacedl2-dw

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