By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
12 rows affected
| INV_REF | IS_VALID |
|---|---|
| MX/3280/20 | Valid |
| CT/3281/20 | Valid |
| MX/3272/20 | Valid |
| CC/3299/20 | Invalid, wrong start |
| TT/3299/20 | Invalid, wrong start |
| MM/3283/20 | Invalid, wrong start |
| XX/3281/20 | Invalid, wrong start |
| ACT/3270/20 | Invalid, wrong start |