Count number of consecutive visits

Question

Every time a logged in user visits the website their data is put into a table containing the userId and date (either one or zero row per user per day):

   44         


        

Answer 1

If it is not necessary to have a log of every day the user was logged on to the webiste and you only want to know the consecutive days he was logged on, I would prefer this way:

Chose 3 columns: LastVisit (Date), ConsecutiveDays (int) and User.

On log-in you check the entry for the user, determine if last visit was "Today - 1", then add 1 to the columns ConsecutiveDays and store "Today" in column LastVisit. If last vist is greater than "Today - 1" then store 1 in ConsecutiveDays.

HTH