使用SQL获得独特的计数？

Question

SQL专家的简单SQL。

我有两个字段（AccountNo，CheckNo）。可以有多个具有相同值的checkno。它将拥有相同的AccountNo。我希望mytable显示AccountNo和CheckNo的列表，以及它存在的次数。

Select Distinct AccountNo, CheckNo, Count(Distinct AccountNo, CheckNo) as Total
from MyTable

Answer 1

你所追求的是GROUP BY

Select AccountNo, CheckNo, Count(*) as Total
from MyTable
group by AccountNo, CheckNo

Answer 2

Select AccountNo, CheckNo, Count(*) as Total
from MyTable
group by AccountNo, CheckNo