How to link PrivateMembersData database to another database?

Thanks @fraser , but how would you display them? Because each database for me has unique _id fields in them…

This is what I have
PrivateMembersData
| First Name | Last Name | ID |
| A | B | 1as-d4s-d |

Database 1
| First Name | Last name | Score | ID |
| A | B | 50 | 54-dp2-w6 |

For my dynamic page I have my URL to include the ID field (it was the only unique field I got). So that’s where I got my problem. If the link loads using one of the ID, only the database that has that ID will show the data, but not both. Did you set your url to be a different field?