Has just hired a Australian bank operations engineer post data analysis, there are 20 days into the job, but I want to know about the foreign Banks in general use what version of Unix? Now I will only Linux centos, ubuntu and need to learn? If you want to use Unix, need to learn Unix again? What's the distribution of Unix?

The basis of the database, I also will only mysql, HR said that the company using the teradata database and data warehouse, this how to self-study again? Baidu rarely relevant content! Be urgent!!!!!!