sql-server - 如何找到具有行数的不同值？

Question

我需要很小的要求，我有以下输入。

ReportId   ReportName

1            Adhoc
1            Adhoc
2            Financial
2            Financial
2            Financial
3            Dynamic
3            Dynamic
3            Dynamic
3            Dynamic

我需要像这样

ReportId   ReportName
    2    Adhoc
    3    Financial
    4    Adhoc

请给我解决方案

Answer 1

select count(*),reportname from tbl group by reportname;

Answer 2

我认为您在问题中错误地提到了您想要这样的输出。

ReportId   ReportName
    2    Adhoc
    3    Financial
    4    Dynamic

以下查询将为您提供上述输出。

select Reportname, count(1) as ReportIdcount
from   Reportstb
group by reportname;

Answer 3

select count(ReportName) as howMany, ReportName 
from reports
group by ReportName 
order by howMany asc

Answer 4

如果您在第一列中寻找计数，那么这将有所帮助：

SELECT Count(ReportName), ReportName FROM Table1 group by ReportName