Question

I’m trying to get the average of a ratio in SQL.

My table looks like this:

T_TOTAL  |  NUM_ASSETS
----------------------
   32    |     8
   20    |     4
   24    |     4

And so that value I’m after is 5 as in:

T_TOTAL  |  NUM_ASSETS  |  T_TOTAL/NUM_ASSETS
---------------------------------------------
   32    |     8        |         4
   20    |     4        |         5
   24    |     4        |         6
                          -------------------
                             AVG = 5

So far I have this but it’s not working:

SELECT T_TOTAL As Time, NUM_ASSETS As Assets,
Time/Assets As TimePerAsset, AVG(TimePerAsset) As Result
FROM MATCHES

Any ideas?

Answer 1

select avg(t_total/num_assets) from matches

And if you have 0 in num_assets, you can avoid a division by 0 like this:

select avg(t_total/nullif(num_assets, 0)) from matches