SQL-计算不同的次数？

Question

I have a database like this:

Name, Day, Calls

The day represents the date, the calls the number of phone calls they made. Is there an SQL syntax to return the total calls made on that day? I'm presuming its COUNT DISTINCT but I cannot make it return the instance of eg two people, same day and the return should be the total for both.

Answer 1

SELECT Day, SUM(Calls) FROM table GROUP BY Day;