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In 5 days I’m going to ETL interview. It’s my first interview on this subject. What question would I be asked? Most likely they will be about MS SQL Server Integration Service.
If possible, provide the answers. =)
Think practically. Hand them a printout of a sample file that might need to be imported (possibly simplified to save time). Have them talk about database design, considerations, concerns, possible ways to improve the data. Then bring out a second printout of somehow related and see if they can figure how to validate the one from the other.
Make sure you talk about how much time is available to perform the ETL processes based on business rules and environment.
Require as much pseudo-code as you like, but I personally subscribe to the idea that syntax can be taught cheaply, but learning how to think is a very expensive thing to teach someone; and sometimes it’s not even successful.
Also, ask them what standards they would implement if they were to design the optimum layout of the source data. Make sure you consider data distribution beyond your company (if applicable).