(Solved): 5- table with user registration data. We store information about how many users registered on each d ...

5- table with user registration data. We store information about how many users registered on each date. We define a data series as the sequence of consecutive days when users registered. A day when no user registers breaks the data series. For each data series, we want to find its length.

There are 3 different data series shown in different colors. We are looking for a query to obtain the length of each data series. The first data series starts on Jan 25 and has a length of 3 elements, the second one starts on Jan 30 and its length is 4, and so on.