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Oracle Tutorials - Rename a Column in an Existing Table

By: FYIcenter.com

(Continued from previous topic...)

How To Rename a Column in an Existing Table?

Let's say you have an existing with an existing column, but you don't like the name of that column, can you rename that column name? The answer is yes. You can use the ALTER TABLE ... RENAME COLUMN statement to do this. See the following SQL script:

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

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

SQL> ALTER TABLE emp_dept_90 RENAME COLUMN first_name
  2  TO fname;
Table altered.

SQL> SELECT fname, last_name FROM emp_dept_90;
FNAME                LAST_NAME                
-------------------- -------------------------
Steven               King                     
Neena                Kochhar                  
Lex                  De Haan                  

As you can see the column "first_name" is nicely changed to "fname".

(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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