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Oracle Tutorials - Add a New Column to an Existing Table with a Default Value

By: FYIcenter.com

(Continued from previous topic...)

How To Add a New Column to an Existing Table with a Default Value?

If you want to add a new column to an existing table, and insert a default value in this column on all existing data rows, you can use the ALTER TABLE ... ADD statement with the DEFAULT clause. Here is an example script:

SQL> CREATE TABLE emp_dept_90 
  2  AS SELECT * FROM employees WHERE department_id=90;
Table created.

SQL> ALTER TABLE emp_dept_90
  2  ADD (vacation NUMBER DEFAULT 10);
Table altered.

SQL> SELECT first_name, last_name, vacation
  2  FROM emp_dept_90;
FIRST_NAME           LAST_NAME                   VACATION
-------------------- ------------------------- ----------
Steven               King                              10
Neena                Kochhar                           10
Lex                  De Haan                           10

As you can see, the "DEFAULT 10" clause did inserted 10 to 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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