Recursive CTE sql query for calculating Rolling returns - sql

Question

My first time writing a recursive CTE in SQL to calculate the rolling returns.
Formula : 100*(1+Returns) for first value, and then (RollingReturns)*(1+Returns)
The table is as below:
+----+--------+--------+----------------+
| ID | Date | Return | RollingReturns |
+----+--------+--------+----------------+
| 1 | 1/1/20 | 0.50% | 100.5 |
| 1 | 1/2/20 | 1.00% | 101.51 |
| 1 | 1/3/20 | -0.7% | 100.74 |
| 1 | 1/4/20 | 0.50% | 101.25 |
+----+--------+--------+----------------+
My attempt at writing the SQL query:
WITH rn_cte AS (
SELECT ROW_NUMBER() OVER (ORDER BY DATE ASC) AS RN, DATE
FROM TABLE WHERE ID = 1
ORDER BY RN
)
rr_cte
AS
(
SELECT RN,P.DATE,RETURNS,RETURNS AS ROLLINGRETURNS
FROM TABLE P
JOIN rn_cte ON rn_cte.DATE = p.DATE
WHERE P.ID = 1 AND RN = 1
UNION ALL
SELECT RN,pm.DATE,pm.RETURNS,(rr_cte.ROLLINGRETURNS)*(1+pm.RETURNS) AS ROLLINGRETURNS
FROM TABLE pm WHERE pm.ID = 1
JOIN rr_cte ON rr_cte.RN = pm.RN+1
ORDER BY pm.DATE ASC
)
SELECT *
FROM rr_cte
It gives me an error, not sure what is wrong in it.
Error
^found "RR_CTE" (at char 145) expecting `SELECT' or `'(''
Any help is appreciated.
Thanks in advance!

Answer 1

You want something like this:
WITH rn AS (
SELECT ROW_NUMBER() OVER (PARTITION BY id ORDER BY DATE ASC) AS RN, t.*
FROM TABLE t
WHERE ID = 1
),
cte AS (
SELECT rn.rn, rn.id, rn.date, return,
100 * (1 + rn.return) as rollingreturn
FROM rn
UNION ALL
SELECT rn.rn, rn.id, rn.date, rn.return,
cte.rollingreturn * (1 + rn.return)
FROM cte JOIN
rn
ON cte.id = rn.id AND rn.rn = cte.rn + 1
)
SELECT *
FROM cte;