date - SQL Datetime Avg -


i trying avg total days between 2 dates using sql.

my table follows

intsalesperson dtmdatesetup         dtmwelcomelettersent 1              2015-02-18 22:47:13.890  2015-03-19 19:53:04.153 1              2015-03-06 13:04:20.730  2015-03-19 19:55:29.800 1              2015-03-16 18:16:43.290  2015-03-19 19:55:25.690

my sql query this? 

select avg([dtmdatesetup] - [dtmwelcomelettersent]) avg_days [tblcustomer] [intsalespersonid] = 1 , [dtmwelcomelettersent] not null

result should 

avg_days 15

thanks.

first calculate days between each date (i'm assuming sql server):

select [dtmdatesetup], [dtmwelcomelettersent],    datediff(day,dtmdatesetup,dtmwelcomelettersent) [tblcustomer] [intsalespersonid] = 1 , [dtmwelcomelettersent] not null

then average easy:

select avg(datediff(day,dtmdatesetup,dtmwelcomelettersent)) [tblcustomer] [intsalespersonid] = 1 , [dtmwelcomelettersent] not null

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