How to use live aggregated projection ?
I have situation where I need to use aggregated query within a sub query.
select
x.col1,
x.col2,
x.col3,
b.col5,
b.col6
(
select
a.col1,
sum(a.col2) as col2,
sum(a.col3) as col3,
sum(nvl(col3,0)) as col4
from
table1 a
where
col4 between to_date('09/01/2016', 'MM/dd/yyyy') AND to_date('08/31/2018', 'MM/dd/yyyy')
group by
col1
) x
join table2 b on x.col1 = b.col1
Here in this query, inner sub-query is taking to long time. So I try to use live aggregated projection. After creating a projection like:
CREATE PROJECTION table1_lap AS
SELECT
col1
SUM(col2) col2,
SUM(col3) col3
FROM table1
GROUP BY col1;
But execution time did not reduce. Please tell me the solution.
Thank you....
Cristiano
0
Comments
In this case, use Trunc(col4) in Projection (as in group by clause as well &it will give best performance if used in segmented by clause as well, as colu4 is in Filter condition).