Merge monthly to spell data

[Henry Strawforrd]

I have two datasets, in one I have an ID and a month. The second is spell data with ID, start_date, and end_date. How would you combine these? Generate duplicate entries for each month in a spell in the second one?

[Fei Wang]

Henry, using -dataex- to display examples of the two data and telling us more about what your merged data should look like will be helpful.