This might be off topic but wanted to ask as it relates to IT anyway. I came to know of a QA called Datawarehouse/ETL testing. This is not a click here and there qa that people associate with. It requires you to know sql pretty well and have solid understanding of database concepts, data warehouse etc. In any projects, are there just a single qa or a team of qa to do ETL testing? I guess it depends as per my common sense, in order to test so many functionality and scenarios , there will be a team of testers to do the jobs. A friend of mine works by himself as an ETL Developer but another one works in a team of ETL developer. Any idea or experience one can share working as a qa? Did you work alone or in a team of QA? Thanks,