php - MySQL Query Help - DATEDIFF and Writing Results to A New Column -

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OK, I have an unpleasant problem to solve and I've been stumped.

I have a MySQL table essentially 

  id Tronsdet Startdet ended Unit 1 Unit 1 Product Unit 2 Unit 2 Pross 1 2014-07-31 2014- with this structure 10-25 2014-10-29 22 hits 25.00 27 25.00   
 I need to do is make another column which Kuldin which calculates the number of days between Startdet and ended.  
 How do I do this?  
 Thank you very much   
 
 
 - Create columns  
 < Change the code> table YourTableName column add daysdiff int;   
 - Update the new column with the appropriate calculations  
  update YourTableName set daysdiff = datediff (enddate, startdate);

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