Adding data to an existing table and editing that data in the table are important parts of maintaining a current and complete GIS. There are several ways to add data to tables.
Use geoprocessing to add data
With geoprocessing, you can use tools to update existing fields, append records to a table permanently, or append fields to a table dynamically with a join.
Calculate Field tool
The Calculate Field tool can be used to update existing fields or newly created fields for a feature class, feature layer, or raster catalog. You can calculate numbers, text, or date values into a field. Using code blocks, you can write scripts to perform advanced calculations.
Add Join tool
The Add Join appends the fields from the join table to a base table.
Typically, you'll join a table of data to a layer based on the value of a field that can be found in both tables. The name of the fields do not need to be the same, but the data type does; you join numbers to numbers, strings to strings, and so on.
When you create a joined table, the appended fields can then be used in field calculations or for labeling, symbolizing, or querying the data. The fields that are appended from the join table are not permanently attached to the base table. Joins can be undone to remove the appended fields.
Add Field tool
The Add Field tool adds a new field to your current table or the table of a feature class, feature layer, raster catalog, or rasters with attribute tables. The newly added field will include the default values defined for this field in Field View. If no default value is defined, the field will contain NULL or empty values.
Use the Append tool to add new features or other data from multiple datasets into an existing dataset. This tool can append point, line, or polygon feature classes, tables, rasters, raster catalogs, annotation feature classes, or dimensions feature classes into an existing dataset of the same type. For example, several tables can be appended to an existing table, or several rasters can be appended to an existing raster dataset, but a line feature class cannot be appended to a point feature class.
Add Geometry Attributes tool
The Add Geometry Attribute tool will add new fields and populate them with spatial or geometric characteristics of each feature, such as length, area or x,y,z coordinates.
Use the Attributes pane to perform updates
Another way to update existing feature attributes is to use the Attributes pane. A selection is required to perform the edits, and you work from within the map or scene, instead of the open table. On either the Map or Edit tabs, in the Selection group, click Attributes.
Use Fields view to create, modify, and delete fields
Fields view is used to manage the fields associated with a table. Within Fields view you can make edits to a table's fields, modify their properties, delete fields, or create new ones. To open the Fields view, right-click a column heading in the table and click Fields View.