esProc is a professional structured computing tool, which is ready to use, built-in with SPL language more natural and easier to use than python. The more complex data processing is, the more obvious the features of simple SPL syntax and clear steps are. You can observe the result for each action and controlled the calculation process at will according to the outcome. It is especially suitable to solve the problem of order-related calculation, such as the typical problems in desktop data analysis: same period ratio, ratio compared to last period, relative interval data retrieving, ranking in groups, TopN in groups. esProc can directly process the data files such as CSV, Excel, JSON, and XML.