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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.tableNode 3Node 4Node 5 ChoroplethWorld Map Table Reader GroupBy Rule-basedRow Filter Table Rowto Variable Northmost Countryby Continent 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.tableNode 3Node 4Node 5ChoroplethWorld Map Table Reader GroupBy Rule-basedRow Filter Table Rowto Variable Northmost Countryby Continent

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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: 2023-06-06
Last update: 2024-12-17
Created with KNIME version: v4.7.2
Tags: educationself-pacedl2-dw

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