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Add Field To Table. In ArcMap you can add a field through the attribute table of a layer or through the Catalog window by accessing the same Properties dialog box and Fields tab. Press the TAB key to go to.
Optionally you can enter one or more criteria in the Criteria row of the design grid. One big difference of SelectColumns and AddColumns is that AddColumns keep all the existing columns in the table and adds more columns to that But the SelectColumns starts with no columns from the table and builds a custom subset of. The column name is a required value.
You can also right-click any column and choose Fields or click the menu button and click Fields.
Second specify the column definition after the ADD COLUMN clause. You can use DDL to create fields. For example the following statement adds a 25-character Text field called Notes to the Employees table. In addition to query the data if we are the database administrator we also need to know how to add modify delete the table and the fields and data in the table.