How To Add a New Column to an Existing Table with a Default Value
Q
How To Add a New Column to an Existing Table with a Default Value? - Oracle DBA FAQ - Managing Oracle Database Tables
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A
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.
2007-05-03, 4596👍, 0💬
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