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Getting pct from SUM data

I'm trying to get my sql working to get % from data from 2 sum'd columns IE : SELECT SUM(NumCalls) as SUM_NumCalls, SUM(NumCompleted) as SUM_NumCompleted , (SUM_NumCompleted * 100 / SUM_NumCalls ) as `% Completed` FROM my_schema.my_table GROUP BY Company ;

Error Code: 1054. Unknown column 'SUM_NumCompleted' in 'field list'

Answer Answered by Ian Gilfillan in this comment.

You cannot use the alias there, as it hasn't been evaluated yet. Something like:

SELECT 
  SUM(NumCalls) as SUM_NumCalls, 
  SUM(NumCompleted) as SUM_NumCompleted, 
  (SUM(NumCompleted) * 100 / SUM(NumCalls)) as  ...

should work.

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