Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
How To Add a New Column to an Existing Table
How To Add a New Column to an Existing Table? - Oracle DBA FAQ - Managing Oracle Database Tables
✍: FYIcenter.com
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, 4958👍, 0💬
Popular Posts:
Is There Any XSD File to Validate Atom Feed Files? - RSS FAQs - Atom Feed Introduction and File Gene...
What is difference between custom JSP tags and JavaBeans? Custom JSP tag is a tag you defined. You d...
How can you write a loop indefinitely? Two examples are listed in the following code: for(;;) { ... ...
How is the MVC design pattern used in Struts framework? In the MVS design pattern, there 3 component...
How does ASP.NET maintain state in between subsequent request ? Refer caching chapter.