Hi, I'm trying to add an index that increments by one for each change in customer:
My data
| account_no |
| 10545321 |
| 10545321 |
| 17735208 |
| 17735208 |
| 56193802 |
| 64266537 |
| 64266537 |
| 64266537 |
My desired result
| account_no | index |
| 10545321 | 1 |
| 10545321 | 1 |
| 17735208 | 2 |
| 17735208 | 2 |
| 56193802 | 3 |
| 64266537 | 4 |
| 64266537 | 4 |
| 64266537 | 4 |
Thanks!