Changing multiple select query into CTE query - sql

Question

I want to change this particular simple select query into CTE in order to optimize it, as this simple three select query taking 4 mins and so, I want to reduce the execution time of it by converting it into CTE query.
select sum(AMOUNT) usd from data where status IN ('ACCEPTED','REJECTED','CANCELLED') and date between '01-SEP-18' and '30-NOV-18'
UNION
select sum(AMOUNT) usd from data where status IN ('ACCEPTED','REJECTED','CANCELLED') and date between '01-NOV-18' and '31-JAN-19'
UNION
select sum(AMOUNT) usd from data where status IN ('ACCEPTED','REJECTED','CANCELLED') and date between '01-FEB-19' and '30-APR-19'
ORDER BY usd DESC ;
The expected result should be one column showing the result of the three queries, which is the sum as usd of the amount in this query.
Example:
USD
100 (timeline 1)
200 (timeline 2)
300 (timeline 3)
The one I tried:
Can you conver this CTE query with sum instead of count.
WITH cte AS (
SELECT
COUNT(CASE WHEN status_date BETWEEN '2018-11-01' AND '2019-01-31' THEN 1 END) AS cnt1,
COUNT(CASE WHEN status_date BETWEEN '2019-02-01' AND '2019-04-30' THEN 1 END) AS cnt2,
COUNT(CASE WHEN status_date BETWEEN '2019-05-01' AND '2019-07-31' THEN 1 END) AS cnt3
FROM data
WHERE status IN ('ACCEPTED', 'REJECTED', 'CANCELLED')
)
SELECT cnt1 FROM cte
UNION ALL
SELECT cnt2 FROM cte
UNION ALL
SELECT cnt3 FROM cte;

Answer 1

I am guessing that you don't want the timelines to overlap, so:
select (case when date between '01-SEP-18' and '30-NOV-18' then 'timeline1'
when date between '01-DEC-18' and '31-JAN-19' then 'timeline2'
when date between '01-FEB-19' and '30-APR-19' then 'timeline3'
end), sum(AMOUNT) as usd
from data
where status IN ('ACCEPTED','REJECTED','CANCELLED') and
date between '01-SEP-18' and '30-APR-19'
group by (case when date between '01-SEP-18' and '30-NOV-18' then 'timeline1'
when date between '01-DEC-18' and '31-JAN-19' then 'timeline2'
when date between '01-FEB-19' and '30-APR-19' then 'timeline3'
end)
order by usd desc;
If you do, separate columns are probably simpler:
select sum(case when date >= date '2018-09-01' and date < date '2018-12-01' then amount end) as usd_timeline1,
sum(case when date >= date '2018-11-01' and date < date '2019-02-01' then amount end) as usd_timeline2
sum(case when date >= date '2019-02-01' and date '2019-05-01' then amount end) as usd_timeline3
from data
where status IN ('ACCEPTED','REJECTED','CANCELLED') and
date >= date '2018-09-01' and date < date '2019-05-01'
order by usd desc;
Note that this uses date constants using the ISO standard YYYY-MM-DD format and the date keyword.