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Oracle Tutorials - Add a New Column to an Existing Table

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 Is a Database Table?
  2. How Many Types of Tables Supported by Oracle?
  3. How To Create a New Table in Your Schema?
  4. How To Create a New Table by Selecting Rows from Another Table?
  5. How To Rename an Existing Table?
  6. How To Drop an Existing Table?
  7. How To Add a New Column to an Existing Table?
  8. How To Add a New Column to an Existing Table with a Default Value?
  9. How To Rename a Column in an Existing Table?
  10. How To Delete a Column in an Existing Table?
  11. How To View All Columns in an Existing Table?
  12. How To Recover a Dropped Table?
  13. What Is Recycle Bin?
  14. How To Turn On or Off Recycle Bin for the Instance?
  15. How To View the Dropped Tables in Your Recycle Bin?
  16. How To Empty Your Recycle Bin?
  17. How To Turn On or Off Recycle Bin for the Session?
  18. How To List All Tables in Your Schema?

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