I'm looking to do a conditional join if x/x (e.g., 2/4) fields match.
In the example below these two rows would join because two of the four fields (DOB and last name) match.
Table 1
| Date of Birth | First Name | Last Name | City |
| 01/01/85 | John | Doe | Springfield |
Table 2
| Date of Birth | First Name | Last Name | City |
| 01/01/85 | Jon | Doe | Springfeild |