title: Fetching data from two different sheets of excel in rapidminer
body: <p>I am a beginner in rapidminer. I am working on a project where I need to work on multiple sheets of excel say A and B. There is some data which is present in sheet A, and I have to use this data and perform arithmetic operations on it and some data from sheet B and produce results in sheet B.</p>
  
  <p>I am using read excel operator for fetching excel sheet. And I am using generate attributes to perform arithmetic operations. I found loop operator is used when we are dealing with multiple sheets. But it requires that all the column names of all the sheets should be same. In my case, they are not. So what should I do? How to use multiple sheets when they don't have same column names?
  Thanks</p>