On 12-08-2012 20:49, Klaas V wrote:
Keith Metcalf wrote:
id Sales_vol mov_avg
1 1
2 2
3 3 =(1+2+3)/3
4 5 =(2+3+5)/3
5 4 =(3+5+4)/3
6 2 =(5+4+2)/3
7............
select id, sales_vol, (select avg(sales_vol) as mavg
from tbl b
where b.id between a.id - 3 and a.id)
from tbl a;
- 3 should be - 2. You're working with the last 4 days and might get an error
if id=3
:P
Why 'might' there be an error?
It perfectly valid to write:
..... where b.id between 0 and 3)
or
..... where b.id between -1 and 2)
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