Whether you are working with a table that is very small or very large, the first step to answering an analytical question is to narrow down the data you are working with so you see only the pieces of information that apply.
When you work with very large data sets like those typically found in the Insights Platform, the order in which you perform operations on the data makes a difference in how fast the system can complete those operations. If you make the largest selection that eliminates the most data first, then the subsequent operations you perform finish faster because the platform does not need to work with as much information. As a best practice, if your data contains columns with date- or time-related information, that is generally the best place to start. However, the largest selection may be something other than date or time information and is based on your data and the analysis you want to perform.