Oracle Rolling or Running totals by month

Question

Goal: Rolling/Running total for all statements at the end of each month.

Code:

select 
    TRUNC(ACTHX.STMT_HX_STMT_DATE, \'MM\') AS MNTH, 
    COUNT(ACT         


        

Answer 1

An alternative solution that provides the same rolling totals without the sub query.

SELECT
        DISTINCT TRUNC(ACTHX.STMT_HX_STMT_DATE,'MM') AS MNTH
        ,count(ACTHX.INVOICE) OVER (ORDER BY TRUNC(ACTHX.STMT_HX_STMT_DATE,'MM')) AS STMTS
    FROM  ACTHX
    ORDER BY
        TRUNC(ACTHX.STMT_HX_STMT_DATE,'MM')