How to insert random unique values in 2 columns ?

Posted on 16th Feb 2014 by admin

I have table with 2 columns

Create Table code_for_code (
first_code varchar2(10) unique not null,
second_code varchar2(10) unique not null );

and i want to make PL/SQL code to insert random unique values in both columns , for instance 20 records ........ how can i do something like that ?

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