Currently, there are 3 data types supported in ADF variables: String, Boolean, and Array. The first two are pretty easy to use: Boolean for logical binary results and String for everything else, including the numbers (no wonder there are so many conversion functions in Azure Data Factory that we can use).
I’ve also blogged about using Variables in Azure Data Factory:
– Setting Variables in Azure Data Factory Pipelines
– Append Variable activity in Azure Data Factory: Story of combining things together
– System Variables in Azure Data Factory: Your Everyday Toolbox
– Azure Data Factory: Extracting array first element
Click through for arrays and follow up with those other posts from there.