Hi, I'm relatively new to the Data mining. Whatever the online tutorials and the books that I checked, explain the Data mining concepts using a single Database Table. But practically, there will be around 50-100 tables for typical projects. I'm not clear how do we have to use these tools in such cases? For example, I will have to perform clustering for all the data available in the Database, and the Database contain around 65 tables. I'm sure that this is a very typical case for all. How do I have to proceed in such cases? Please elaborate if there are any preprocessing steps that are necessary. Regards, Micheal