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# SUMs from either of two columns

I have a table with four fields: TeamHost, TeamAway, PointsHost, PointsAway. A sample of such data are teams from...

Bundesliga:

```TeamHost   TeamAway   PointsHost PointsAway
Stuttgart  Dortmund       3          0
Dortmund   Stuttgart      1          1```

I want to produce a query that can display the fields Team, TotalPoints like:

```Team       Totalpoints
Stuttgart      4
Dortmund       1```

It's easy to obtain separate home and away totals for each team based on whether the team is TeamHost or TeamAway. The following two queries will accomplish this:

```select TeamHost   as Team
, Sum(PointsHost) as SubTotal
from matches
group by TeamHost```
```select TeamAway   as Team
, Sum(PointsAway) as SubTotal
from matches
group by TeamAway```

Now all we need to do is add these two subtotals together.

```select Team
, sum(SubTotal) as Totalpoints
from (
select TeamHost   as Team
, Sum(PointsHost) as SubTotal
from matches
group by TeamHost
union all
select TeamAway   as Team
, Sum(PointsAway) as SubTotal
from matches
group by TeamAway
) as U
group by Team ```

The outer SELECT combines the two subtotals into one total for each team.

Alternatively, we could have used a JOIN here instead, because there is only one row per subtotal per team.

```select H.Team
, H.SubTotal
+A.SubTotal as Totalpoints
from (
select TeamHost   as Team
, Sum(PointsHost) as SubTotal
from matches
group by TeamHost
) as H
inner
join (
select TeamAway   as Team
, Sum(PointsAway) as SubTotal
from matches
group by TeamAway
) as A
on H.Team = A.Team```

My preference, however, is for the UNION. It seems to me to be a more natural approach to this type of problem.

This was last published in February 2005

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