What is the highest number of active users during a specific date range in SQL Server?

edit

To find the highest number of active users during a specific date range in SQL Server, you would first need to have a table that records the user activity. Assuming you have such a table and it has a column for the user ID and a column for the date/time of the activity, you could use the following query:

SELECT count(distinct userID) as active_users
FROM user_activity
WHERE activity_time >= 'start_date' and activity_time < 'end_date'
GROUP BY activity_date
ORDER BY active_users DESC
LIMIT 1;

Replace 'startdate' and 'enddate' with the actual start and end dates for your desired range. The query counts the number of distinct user IDs that appear in the table within the given date range and orders them by the number of active users in descending order. The LIMIT 1 clause returns only the highest count, representing the highest number of active users during the specified date range. The result will be a single row with a single column containing the number of active users.