Need help in refactoring query as Grid db doesn't support with clause CTE

I am working on a project where I need to use the "WITH" clause to create CTE's in my queries. This works well in SQL Server, but I found out that GridDB does not support the "WITH" clause.

I tried using this code:

def top_customers(gridstore):    query = """    WITH HighValueCustomers AS (        SELECT             CustomerID        FROM             Orders        GROUP BY             CustomerID        HAVING             COUNT(*) > 15    ),    AverageOrderAmount AS (        SELECT             CustomerID,            AVG(OrderAmount) AS AvgOrderAmount        FROM             Orders        GROUP BY             CustomerID    ),    MostValuableCustomers AS (        SELECT             hao.CustomerID        FROM             AverageOrderAmount hao        JOIN             HighValueCustomers hv ON hao.CustomerID = hv.CustomerID        WHERE             hao.AvgOrderAmount > 100    ),    TopCustomers AS (        SELECT             pc.CustomerID,            COUNT(*) AS TotalOrders        FROM             Orders o        JOIN             MostValuableCustomers pc ON o.CustomerID = pc.CustomerID        GROUP BY             pc.CustomerID    )    SELECT         tc.CustomerID,        tc.TotalOrders,        c.FirstName,        c.LastName,        c.Email    FROM         TopCustomers tc    JOIN         Customers c ON tc.CustomerID = c.CustomerID;"""    try:        results = gridstore.query(query)        while results.has_next():            print(results.next())    except griddb.GSException as e:        print (f"Error Message: {e.get_message()}")def main():    try:        gridstore = connect_to_griddb()        top_customers(gridstore)    except griddb.GSException as e:        print(f"General GridDB Exception: {e}")    finally:        gridstore.close()if __name__ == "__main__":    main()

I get an error:

Error Message: Syntax error: unexpected 'WITH'

I want to fetch top customer based on orders amount and value etc. This query works well with SQL Server, but causes error in grid dB.

Kindly guide me on how I can improve logic on query level or python application level so that I can get desired result (application-level logic in Python will be highly appreciated but query level is also welcomed).