How can I gain access to a database to which my university does not have access I'm a PhD-student in economics and I'm planning a scientific paper on a certain topic. For this purpose I need access to data from an economic database. There exist several companies, which provide the desired datasets in their databases.
But the problem is that my university has no access to any of these databases. It is also possible to buy certain datasets there individually, but my research budget is far from sufficient to buy this data.

So I would like to ask if there is a possibility to get such data on another way?

I had already considered whether it makes sense to write this article with a researcher from another university that has access to one of these databases. 
The disadvantage in this case is that the name of the other researcher stands on my paper without having made any significant contribution.

Furthermore I thought about doing a short research stay at a foreign university, which has access to a database. However, this is hardly feasible under the current global circumstances.

Unfortunately, my PhD-supervisor also has no answer to my problem.

I would be very happy if someone in a similar situation has found a solution and can tell me about it. I would like to ask not only specifically in the field of economics but in general. It may be that the solution can be transferred from another area to mine.
I would ask your university librarians -- they tend to be resourceful and under-used! At least for journals to which the university does not subscribe, there are typically ways to request single articles, often through inter-library consortia. I wouldn't be surprised if similar things exist for brief access to databases.