Re: Merge lines to get rid of nullvalues?

Originally posted by Tim Gahnstroem
> Hi
>
>
> Is it possible to merge rows in SQL to get rid of null values?
> I have a select query that gives me a table (simplified) on this form:
>
> A B C
> Key1 "text1" null
> Key1 null 7
> Key2 "text2" null
> Key2 null 3
> Key3 null 9
> Key4 "text4" null
> Key4 null 79
>
> A is actually a number of columns but the values on the whole row only
> differs in the last 2 columns (B and C).
>
> B is a CHAR column and C is a NUM
>
> I want to merge the rows with the same key and put the values in the
> null-fields, like this:
>
> A B C
> Key1 "text1" 7
> Key2 "text2" 3
> Key3 null 9
> Key4 "text4"79
>
> As you can see, it is not always 2 keys, so some fields might still be
> null.
>
> I might get around the problem by making several queries and
> subqueries and join them afterwards but it will be very ugly and slow
> so I would really like to know if there is another solution
>
> I don't think it is needed but anyhow, this is about how the SQL code
> looks like, I interface Oracle with Excel VBA.
>
> SELECT A, B, C
> FROM r5events EV, r5propertyvalues VAL, R5PROPERTIES PROP
> and EV.evt_mrc= 'JKLO'
> and VAL.prv_property=PROP.pro_code
> and EV.evt_code=val.prv_code(+)
>
> Thanks,
>
> Tim

Try:

SELECT A, max(B), max(C)

   FROM r5events EV, r5propertyvalues VAL, R5PROPERTIES PROP    and EV.evt_mrc= 'JKLO'
   and VAL.prv_property=PROP.pro_code
   and EV.evt_code=val.prv_code(+)
group by a;

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