How can a field be deleted from a table in Oracle?

You can use the ALTER TABLE statement to delete table fields. Here are the specific steps:

1. Open the SQL command line or another database management tool.
2. Please input the following SQL statement: ALTER TABLE table_name DROP COLUMN column_name.
3. In the above statement, table_name is the name of the table where the field is to be deleted, and column_name is the name of the field to be deleted.
4. Executing the SQL statement above will remove the specified table field.

Please make sure to back up the data before deleting a table field, as deleting the field will result in the loss of that data.