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.
