How can Oracle add a field to a specific position?

In Oracle, you can use the ALTER TABLE statement to add a column to a specific position. Here are the detailed steps:

1. Firstly, use the DESCRIBE statement or query SELECT * FROM table_name to view the structure and field order of the current table. Pay attention to the field names and data types.
2. Use the ALTER TABLE statement to add a column. For example, to add a column named new_column with a data type of VARCHAR2(50) to a table, you can use the following syntax:
   ALTER TABLE table_name
   ADD (new_column VARCHAR2(50));
3. Use the DESCRIBE statement or the SELECT * FROM table_name query to confirm the addition of the new field.
4. To add a new column at a specific position, you can use the RENAME COLUMN clause of the ALTER TABLE statement. For example, to move the new_column field to the second position of the table, you can use the following syntax:
   ALTER TABLE table_name
   RENAME COLUMN new_column TO temp_column;
5. Please note that this step will rename the new field as temp_column.
6. Next, use the ALTER TABLE statement again to add the original column. For example, to add the original column after the new column, you can use the following syntax:
   ALTER TABLE table_name
   ADD (original_column VARCHAR2(50) AFTER temp_column);
7. Finally, rename the temp_column field back to its original column name using the RENAME COLUMN clause of the ALTER TABLE statement. For example, you can use the following syntax:
   ALTER TABLE table_name
   RENAME COLUMN temp_column TO original_column;
8. Execute the DESCRIBE statement or the SELECT * FROM table_name query again to confirm the addition and placement of the new field.

Please note that making changes to the table structure may result in data loss or corruption, so be sure to back up your data before making any changes.