Chapter 7 External databases

Researchers require to add extra information into their data analysis. This is usually extra annotation or even data from an external source (i.e. database). This is effectively a join between two data sets.

The data step called join left and join right are used for this. The extra data requires to be uploaded first. This is done using the standard method of uploading to Tercen.

A common key or keys are required to join the two data sets.

Once joined the extra annotations or data are available for any succeeding step.