Zet - How do I create random data using sql?

How do I create random data using sql?

Look at Dom’s example setting activity_type

UPDATE road_segment
SET activity_type = 
    CASE 
        WHEN random() < 0.25 THEN 'Walked'
        WHEN random() < 0.5 THEN 'Driven'
        WHEN random() < 0.75 THEN 'Hybrid'
        ELSE 'Other'
    END;

#postgres #sql