I ran into one problem that I can not solve for 3 days already. The problem is current, there is a database of two columns of date ("yyyy-mm") and the phone number is unique non-repeating. I want to find out how many new customers each month. Well, the formula is roughly current (the new client is the first month + the new client is the next month ....). If the customer meets the first month he is considered a new customer, then it is on the other month, he is missing a new customer.
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- duanmie9682 2017-06-10 09:38关注
try Something like this:
select year(f2.DateColumn) YearCol, month(f2.DateColumn) MonthCol, count(f2.PhoneNumber) NbNewPhone from ( Select f1.*, row_number() over(partition by f1.PhoneNumber order by f1.DateColumn) rang from yourTable f1 ) f2 where f2.rang=1 group by year(f2.DateColumn), month(f2.DateColumn) order by 1, 2
or if you column is not a date :
select f2.DateColumn, count(f2.PhoneNumber) NbNewPhone from ( Select f1.*, row_number() over(partition by f1.PhoneNumber order by f1.DateColumn) rang from yourTable f1 ) f2 where f2.rang=1 group by f2.DateColumn order by 1, 2
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