Note: This release is in preview. Features described here don’t become generally available until the latest general availability date that Salesforce announces for this release. Before then, and where features are noted as beta, pilot, or developer preview, we can’t guarantee general availability within any particular time frame or at all. Make your purchase decisions only on the basis of generally available products and features.

System Fields

Some fields are system-generated. They are on most Tooling API objects, and are read-only.

These fields are automatically updated during API operations. For example, the Id field is automatically generated when a record is created, and the LastModifiedDate is automatically updated during any operation on an object.

Field	Field Type	Description
Id	ID	Globally unique string that identifies a record. Id fields have Defaulted on create and Filter access.
IsDeleted	boolean	Indicates whether the record has been moved to the Recycle Bin (`true`) or not (`false`). Because this field does not appear in all objects, it is listed in the field table for each object.
CreatedBy	User	The user who created the record. CreatedBy fields have Defaulted on create, Filter, Group, and Sort access.
CreatedById	reference	ID of the User who created this record. CreatedById fields have Defaulted on create, Filter, Group, and Sortaccess.
CreatedDate	dateTime	Date and time when this record was created. CreatedDate fields have Defaulted on create, Filter, and Sort access.
LastModifiedBy	User	The user who last modified this record. LastModifiedBy fields have Defaulted on create, Filter, Group, and Sort access.
LastModifiedById	reference	ID of the User who last updated this record. LastModifiedById fields have Defaulted on create, Filter, Group, and Sortaccess.
LastModifiedDate	dateTime	Date and time when a user last modified this record. LastModifiedDate fields have Defaulted on create, Filter, and Sort access.
SystemModstamp	dateTime	Date and time when this record was last modified by a user or by an automated process (such as a trigger). SystemModstamp fields have Defaulted on create and Filter access.

To verify which fields are available for an object, check the Tooling API WSDL.