- Clustering and regression on relational data with multiple (and varying number) parameters

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I'm a software developer but my passion is data analysis and machine learning, I've been learning and practicing these skills in my free time for a couple of years now. Currently I'm working on a little project analysing my job's company database, trying to gather some information on correlations between different types of objects that we store. I've done some regression analysis on easily labelable data with not much success, most likely because I had to filter out majority of the available data that couldn't be labeled. Now I'm trying to work with a much larger dataset, however assigning relations between objects is something I've been scratching my head and Googling for a while with not much success.