Difference between PUT and MERGE:
If you have 20 columns in SharePoint list and you want to update only 3 columns, PUT will update 3 columns and reset other 17 columns to it’s default value while MERGE will update 3 columns leaving other 17 columns as it is with existing values.
If you have 20 columns in SharePoint list and you want to update only 3 columns, PUT will update 3 columns and reset other 17 columns to it’s default value while MERGE will update 3 columns leaving other 17 columns as it is with existing values.
