对来自同一列的不同值求和

Question

I need to sum all the temperatures for all stations by hour:

station       hour     temperature
-----------------------------------
100             1          2
101             1          2
100             2          4
101             2          4

I want the result to be like this:

hour     temperature
---------------------
1            4
2            8

... where the temperature for station 100 gets added to station 101 (2 + 2 = 4) and so on.

What would be the best way to do this?

Thanks in advance.

Answer 1

try something like this:

select hour,sum(temperature)
from MyTable
group by hour

Answer 2

select hour,sum(temperature) from table_name group by hour;

Answer 3

您需要使用GROUP BY。

SELECT hour, SUM(temperature) FROM myTable GROUP BY hour

Answer 4

Select hour,SUM(temperature) FROM Table GROUP BY hour