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help with JOIN operator.

danielsoydanielsoy Member Posts: 20 Contributor II
edited November 2018 in Help

Hi ppl.

Look what happens when I use JOIN operator to combine to dataset that contains just two examples.

 

Resulting dataset has 4 examples, instead of two.

Why?

 

 

Best Answer

  • Thomas_OttThomas_Ott RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 1,761 Unicorn
    Solution Accepted

    Hi Daniel,

     

    Did you check out this blog post: https://rapidminer.com/tips-tricks-different-ways-to-join-data/ ? 

     

    There are different ways to join data in RapidMiner and each has their unique way to do it. If you were using a Join operator and set to Inner Join and you have matched up the attribute (columns) that you want to join in, then only the records that are found in both data sets is returned. 

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