I work in online marketing analytics, and I do most of my data analysis using excel. However, recently I've come across some job postings listing SQL as one of the qualifications. I've used SQL in the past for things like retrieving, inserting, updating and deleting data from a database. However, I've never really used it as part of a data analysis process, and I'm wondering if it could be, or should be. I feel like you would use SQL to manage your data, but then use another tool (such as R or SPSS?) to analyze the data. Any thoughts would be appreciated.