title: How to get the difference between the values selected by slicer?
body: <p>I am new to Power BI and currently I am working with table visulaizations and slicers. </p>
  
  <p>My data is as follows</p>
  
  <p>Student table:</p>
  
  <p><a href="https://i.stack.imgur.com/XjEcI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XjEcI.png" alt="enter image description here"></a></p>
  
  <p>Date table:</p>
  
  <p><a href="https://i.stack.imgur.com/76I9V.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/76I9V.png" alt="enter image description here"></a></p>
  
  <p>Exam table:</p>
  
  <p><a href="https://i.stack.imgur.com/DOOHz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DOOHz.png" alt="enter image description here"></a></p>
  
  <p>The relationships within the table are as follows:
  <a href="https://i.stack.imgur.com/Lctrp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lctrp.png" alt="enter image description here"></a></p>
  
  <p>I want an output like the image shown below,  I would like to create 2 table visuals that can be filtered on Student Name, Classroom and also have slicer on 2 dates. I need to compute minimum score. The user must be able to select 2 dates at a time on the slicer, the first date selected on the slicer should be attached to my 'Min Score at date1' and second date selected on the slicer should be attached to my 'Min Score at date2', and the third column 'Difference in Score' must be able to calculate the difference between the Min Score at date1 and Min Score at date2.  </p>
  
  <p>Similarly I also want to calculate the average minimum score too</p>
  
  <p><a href="https://i.stack.imgur.com/0umeA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0umeA.png" alt="enter image description here"></a></p>
  
  <p>Please let me know how to proceed or what alternative formula or query or method should I apply to get the desired result.Thanks!</p>