Re: SQL totals

Vern Hamburg wrote on 29/05/2007 09:12:59:

Where does ordnum come from - Craig, you don't
show that field in your sample data. But assuming
it is in a related file, this solution below
looks kind of complicated and could be handled with a simple group
by, as here:

select ordnum, sum(qty)
from ordfile join transact file on ordfile.type = transact.type
group by ordnum, type

I probably should have included this as an alternative - the way the
question was phrased made me think that Craig wanted a result like this:

Ordnum PI total PR total type3 total type4 total
1 20 300 5 10

For me, the type of query I suggested has come in handy for one-time
reports. I suppose that your method + a program to run through the data
and output it nicely is the best way to accomplish this if the set of
transaction types is subject to change.

SELECT ordnum,
SUM (CASE WHEN type = 'PA' THEN qty ELSE 0 END),
SUM (CASE WHEN type = 'PI' THEN qty ELSE 0 END),
SUM (CASE WHEN type = <type3> THEN qty ELSE 0 END),
SUM (CASE WHEN type = <type4> THEN qty ELSE 0 END)
FROM ...

where <typeX> is replaced by the code for the appropriate type.

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