Cumulative Frequency is not in ascending order in Postgres

karankhayani97 — Mon, 08 Feb 2021 15:18:38 GMT

I have made a CTE that shows the orderdate sum of the ordered quantity, and its respective cumulative frequency. I have to keep this line "JOIN cte c2 ON c1.orderdate<=c2.orderdate" in this form only and get the correct results. Please tell me what changes are to be made in the code to get the correct result. The code is done in Postgres. Below is the output which I want.

CODE

NOTE: No changes have to be made in this line "JOIN cte c2 ON c1.orderdate<=c2.orderdate"

WITH cte
AS(
SELECT o.orderdate, SUM(od.quantity) AS "totalsum" FROM orders o
JOIN orderdetails od ON o.orderid=od.orderid
GROUP BY o.orderdate
)
SELECT c1.orderdate, c1.totalsum, SUM(c2.totalsum) FROM cte c1
JOIN cte c2 ON c1.orderdate<=c2.orderdate
GROUP BY c1.orderdate, c1.totalsum
ORDER BY c1.orderdate;

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Cumulative Frequency is not in ascending order in Postgres