SQL Server : sort ranking list - sql

Question

I have a table with 3 columns ordernum, username, and amount. I want to select its rows and show an additional column expected.
The rule for calculating the expected column is as follows:
These rows same OrderNum value will be ranking again based on amount column (Desc order). I don't know how I can describe, but the expected result is shown below :(
I tried with RANK() and ROW_NUMBER(), but have not been able to properly apply above algorithm.
This is my table declaration:
CREATE TABLE data
(
ordernum INT,
username NVARCHAR(30),
amount MONEY
);
This is my table content:
+----------+----------+------------+
| ORDERNUM | USERNAME | AMOUNT |
+----------+----------+------------+
| 1 | test01 | 18382.5079 |
| 1 | test02 | 10476.0000 |
| 1 | test03 | 8128.0000 |
| 1 | test04 | 6680.0000 |
| 1 | test05 | 5388.9673 |
| 1 | test06 | 5356.0000 |
| 12 | test07 | 2806.0000 |
| 12 | test08 | 2806.0000 |
| 12 | test09 | 2806.0000 |
| 14 | test10 | 2530.0000 |
| 15 | test11 | 2330.0000 |
| 16 | test12 | 2183.0000 |
| 16 | test13 | 2182.0000 |
| 17 | test14 | 2000.0000 |
| 18 | test15 | 1621.0000 |
+----------+----------+------------+
And this is my expected result:
+----------+----------+------------+----------+
| ORDERNUM | USERNAME | AMOUNT | EXPECTED |
+----------+----------+------------+----------+
| 1 | test01 | 18382.5079 | 1 |
| 1 | test02 | 10476.0000 | 2 |
| 1 | test03 | 8128.0000 | 3 |
| 1 | test04 | 6680.0000 | 4 |
| 1 | test05 | 5388.9673 | 5 |
| 1 | test06 | 5356.0000 | 6 |
| 12 | test07 | 2806.0000 | 12 |
| 12 | test08 | 2806.0000 | 12 |
| 12 | test09 | 2806.0000 | 12 |
| 14 | test10 | 2530.0000 | 15 |
| 15 | test11 | 2330.0000 | 16 |
| 16 | test12 | 2183.0000 | 17 |
| 16 | test13 | 2182.0000 | 18 |
| 17 | test14 | 2000.0000 | 19 |
| 18 | test15 | 1621.0000 | 20 |
+----------+----------+------------+----------+
Here is a fiddle for the problem: https://dbfiddle.uk/?rdbms=sqlserver_2019&fiddle=4014cb469a9ec8f57ded5a5e0e60adaf

Answer 1

This should work.
select
OrderNum,
Username,
Amount,
RANK() over (order by OrderNum) as Expected
from yourTable