Best way to select random rows PostgreSQL

Question

I want a random selection of rows in PostgreSQL, I tried this:

select * from table where random() < 0.01;

But some other recommend this:

Answer 1

Here is a decision that works for me. I guess it's very simple to understand and execute.

SELECT 
  field_1, 
  field_2, 
  field_2, 
  random() as ordering
FROM 
  big_table
WHERE 
  some_conditions
ORDER BY
  ordering 
LIMIT 1000;