min and if

Wed, 21 May 2014 09:41:20 GMT

I want to sum qty for a range date . the following expression is wrong:

sum( {<dealdate={">=min({<data_origin={'purchase'},dealdate={'<=$(=$(var_date1))>=$(=$(var_date2))'}>} dealdate)"} >} qty)

sum(if(dealdate >=min({<data_origin={'purchase'},dealdate={'<=$(=$(var_date1))>=$(=$(var_date2))'}>} dealdate),qty)

First I must find a the min date for type of 'purchase' , and sum the sales's qty from that date.

topic min and if in QlikView