获取sql中完成的所有计数总和的正确方法

Question

This is my query, I want to get how many numbers of phones call received today as one column, so how do I do a sum using count function?

SELECT (uniquecallerID), [Callername]
FROM [dbo].[phonedatabase] (nolock)
WHERE calltime BETWEEN '2020-08-23' AND '2020-08-24'
-- GROUP BY whatever

If I do a sum, that would just return the total sum? how do I return the total numbers of all calls received today, I would do count uniquecallerID and then put them into sum. How do I do that?

Sample data:

UniqueID    callername
----------------------
2619        Jack
2358        Travie
2359        Travis S

Answer 1

Are you looking for count(distinct) ? Assuming that uniqueCallerID identifies what you want to count:

select  count(distinct uniquecallerID)
from [dbo].[phonedatabase] (nolock)
where calltime >= '2020-08-23' and
      calltime < '2020-08-24'