IBM i Services
There are many system services that can be accessed through system-provided SQL views, procedures, and functions. These provide an SQL interface to access, transform, order, and subset the information without needing to code to a system API.
Information about the supported IBM i releases, including the database PTF groups where each service was introduced or enhanced, is available in the IBM i Technology Updates wiki. See this page for all the details: https://www.ibm.com/support/pages/node/1119123