This video shows you how to create your own functions – known as user-defined functions or UDF – and import them into TDengine. You can then use your UDFs just like any other SQL function to perform the operations you need on your time-series data.
For more information about creating functions, see User-Defined Functions (UDF) in Developer Guide.
For more information about importing the functions that you have created, see User-Defined Functions (UDF) in TDengine SQL.