Cursor to fill a column with an increase in the value

Hello
I had the example table EMP (empno, full name, etc). I've added the username column and I need to fill it with values: emp1, emp2, emp3,..., emp1000..., etc. (until it corresponds to all employees)
Can you please provide an example of code to fill the column?
Thank you in advance.

update emp
set username='emp'||rownum;

Max
http://oracleitalia.WordPress.com

Tags: Database

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CREATE TABLE TESTY
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  STRING    VARCHAR2(100 BYTE),
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/
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