Question

我有来自MS Access的2个查询：查询1：

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

运行查询1后，我获得了唯一用户列表并运行查询2以获取总计数：

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

如何将其转换为SQL studio脚本以获取唯一身份用户，然后计算Date中的总数？请指教，谢谢！

Answer 1

不需要子查询，请尝试：

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

根据评论：

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

Answer 2

试试这样：

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

如何组合这两个查询？

2 个答案: