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Oracle Tutorials - ALTER TABLE - Add a New Column

By: FYIcenter.com

(Continued from previous topic...)

How To Add a New Column to an Existing Table?

If you have an existing table with existing data rows, and want to add a new column to that table, you can use the ALTER TABLE ... ADD statement to do this. Here is an example script:

SQL> connect HR/fyicenter
Connected.

SQL> CREATE TABLE emp_dept_110 
  2  AS SELECT * FROM employees WHERE department_id=110;
Table created.

SQL> ALTER TABLE emp_dept_110 ADD (vacation NUMBER);
Table altered.

SQL> SELECT first_name, last_name, vacation 
  2  FROM emp_dept_110;
FIRST_NAME           LAST_NAME                   VACATION
-------------------- ------------------------- ----------
Shelley              Higgins
William              Gietz

This SQL script added a new column called "vacation" to the "emp_dept_110" table. NULL values were added to this column on all existing data rows.

(Continued on next topic...)

  1. What Are DDL Statements?
  2. How To Create a New Table?
  3. How To Create a New Table by Selecting Rows from Another Table?
  4. How To Add a New Column to an Existing Table?
  5. How To Delete a Column in an Existing Table?
  6. How To Drop an Existing Table?
  7. How To Create a Table Index?
  8. How To Rename an Index?
  9. How To Drop an Existing Index?
  10. How To Create a New View?
  11. How To Drop an Existing View?

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