By Rosaria Silipo, Michael P. Mazanetz
(Requested by way of me on WCD and stuffed as retail by means of their standard.)
This ebook is the a lot awaited sequel to the introductory textual content “KNIME Beginner’s Luck”. construction upon the reader’s first adventure with KNIME, this publication offers a few extra complex good points, like looping, making a choice on workflow paths, workflow variables, analyzing and writing info from and to a database, working R scripts from inside of a workflow, and more.
All new thoughts, nodes, and lines are validated via labored examples and the discovered wisdom is bolstered with routines. All instance workflows, workout ideas, and information units can be found on line.
The aim of this ebook is to raise your information research from a uncomplicated exploratory point to a extra professionally prepared and intricate constitution.
Read or Download The KNIME Cookbook: Recipes for the Advanced User PDF
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Additional info for The KNIME Cookbook: Recipes for the Advanced User
Example text
In fact, all nodes seen so far do not have a data output port (white triangle), but instead a database output port (brown square). This is because they do not output a data table, but just a SELECT query. Sometimes, for very large database tables, it can be useful to create a much targeted SQL query before pulling in the data. In fact, the download of very large database tables might consume all available memory and slow down the database node execution. Similarly to the SQL query refining nodes and following a “Database Table Connector” node, there are nodes to implement an SQL query to follow a database connector node (red square port).
21. Exercise 1: Configuration window of the “Database Writer” node with username and password enabled 41 This copy of the book “The KNIME Cookbook” is licensed to: Darien Rosado Note. The use of username and password instead of a credential identifier is discouraged. In fact the Workflow Credentials are all automatically encrypted, while the username and password are only encrypted if the “Master Key” in the “Preferences” page is activated. In general, usage of “Workflow Credentials” is more secure than using the username and password for each database node.
In some cases, it might be desirable to extend the DateTime column format to include both date and time. 9. Configuration window of the „ Preset Date/Time“ node Preset Date/Time The “Preset Date/Time” node completes the DateTime content of a column with a preset value for time, if time is missing, or of date, if date is missing. If the entire cell content is missing, the “Preset Date/Time” node might fill it with preset values for both date and time. The configuration window requires : - The column of DateTime type to be completed The flag to enable completion of the cells’ content with the date, where the date is missing The preset date value to use for such completion The flag to enable completion of the cell content with the time, where the time is missing The preset time value to use for such completion The flag to enable the replacement of missing values with the preset date and time values We appended a “Preset Date/time” node to the “Time Generator” node to complete both generated dates with a “15:00” time.