How To Add a New Column to an Existing Table
Q
How To Add a New Column to an Existing Table? - Oracle DBA FAQ - Managing Oracle Database Tables
✍: FYIcenter.com
A
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.
2007-05-03, 5485👍, 0💬
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