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By using the delete operation you can delete records of an object, once you deleted records then you can also undelete records
To delete records you have to provide an ID of the records that you want to delete
Undelete:
By using the undelete operation you can undelete records of an object that you have deleted
To undelete records you have to provide an ID of the records that you want to undelete
Erase:
By using the erase operation you can delete records of an object, but when you have erased records you are not able to undelete
To erase records you have to provide an ID of the records that you want to erase
Export
By using the export operation you can export records of an object
You have to provide the file type in which you want to export data