MySQL cumulative sum grouped by date

Question

I know there have been a few posts related to this, but my case is a little bit different and I wanted to get some help on this.

I need to pull some data out of the

Answer 1

I figured out what I needed to do last night... but since I'm new to this I couldn't post it then... what I did that worked was this:

SELECT
   DATE(e.Date) AS e_date,
   count(e.ID) AS num_daily_interactions,
   (
      SELECT 
         COUNT(id)
      FROM example 
      WHERE DATE(Date) <= e_date
   ) as total_interactions_per_day
FROM example AS e
GROUP BY e_date;

Would that be less efficient than your query? I may just do the calculation in python after pulling out the count per day if its more efficient, because this will be on the scale of thousands to hundred of thousands of rows returned.