Summary
In this chapter, we discussed when and how you aggregate which data that will be collected in your dataset.
We started by discussing what data you should be aggregating to make your data easier to analyze once the dataset is created. We followed that up with a brief discussion of when you should aggregate the data. Once we learned what data to aggregate and when it should be aggregated, we discussed the various functions that can be used to aggregate the data. We then wrapped up the chapter by discussing how a SQL query could be broken down into multiple SQL queries to make them easier to troubleshoot and maintain. Then we showed how the queries could be combined using a subquery or a JOIN function to combine the results of multiple queries into a single result set.
You now have the necessary skills to collect data and aggregate it into a result set that will be easy to analyze. In the next chapter, we will continue your SQL journey by learning how to format the data...
