How to Accurately Count Unique Site Visits and Users in MySQL?

Count Unique MySQL Events by Combining DISTINCT and COUNT

The goal is to ascertain the distinct site visits and their corresponding counts for a given period (yesterday in this case). The provided query, however, yields duplicate results for the same site, resulting in an inaccurate count.

To resolve this, rather than directly using DISTINCT, the improved approach combines it with the COUNT function:

Select
     Count(Distinct user_id) As countUsers
   , Count(site_id) As countVisits
   , site_id As site
 From cp_visits
 Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY)
 Group By site_id

Explanation:

• Count(Distinct user_id): Counts the distinct user IDs, providing the number of unique visitors.
• Count(site_id): Counts the distinct site IDs, giving the number of distinct sites visited.
• Group By site_id: Groups the results by site ID, ensuring that the counts are accurate for each unique site.

This query eliminates duplicate results and provides the desired counts of distinct site visits within the specified time frame.

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