When installing into PostreSQL it's important that your database name does not contain uppercase characters.
If you choose a name with upper case, the database will actual create, but then later cannot be connected to, to run the update queries.
Please ensure your databasename only has lower case.
Yellowfin7 - BAD
yellowfin7 - GOOD
If you do run into any installation issues, please email email@example.com with the relevant 'YellowfinInstallLog' located within the Yellowfin folder and any extra information you can provide.