如何组合这两个查询？

Question

I have 2 queries from MS Access: Query 1:

Select Date, Username
From Table1
where Date>='9/1/2013'
group by Date, Username

After run the Query 1, I got the unique users list and run Query 2 to get the total counts:

Select Query1.Date, Count(Query1.Date)
from Query1
Where Date>='9/1/2013'

How do I translate this into SQL studio script to get unique users then count the total numbers from Date? Please advise, thank you!

Answer 1

There's no need for a sub query, try this:

SELECT Date, Count (date)
FROM Database.User.Table1 
Where Date > '9/1/2013' 
Group By date, username

Per the comments:

SELECT Date, username, Count (date)
FROM Database.User.Table1 
Where Date >= '9/1/2013' 
Group By date, username

Answer 2

Try it like this:

Select q.Date, Count(q.Date)
FROM (
    Select Date, Username
    From Table1
    where Date>='9/1/2013'
    group by Date, Username
) q
GROUP BY q.Date