More on random sampling in Oracle

The earlier post Random Sampling using SQL uses dbms_random.random to generate random numbers. A better function is dbms_random.value which generates uniformly distributed random number greater than or equal to 0 and less than 1.
We can rewrite random sampling scripts as the following.
Step 1 . Create random numbers.
create table tbl_app_id_w_rnd as select app_id, dbms_random.value rnd from CELL_PHONE_SERVICE_APPS;
Step 2. Create a view that contains 30% of the records.
create view v_data_testing as select a.* from CELL_PHONE_SERVICE_APPS a, tbl_app_id_w_rnd b where a.app_id=b.app_id and rnd <=0.3;