How can I generate a unique string per record in a table in Postgres?

Question

Say I have a table like posts, which has typical columns like id, body, created_at. I\'d like to generate a unique string with the creation of each post, for use in somethin

Answer 1

Check out a blog by Bruce. This gets you part way there. You will have to make sure it doesn't already exist. Maybe concat the primary key to it?

Generating Random Data Via Sql

"Ever need to generate random data? You can easily do it in client applications and server-side functions, but it is possible to generate random data in sql. The following query generates five lines of 40-character-length lowercase alphabetic strings:"

  SELECT
(
  SELECT string_agg(x, '')
  FROM (
    SELECT chr(ascii('a') + floor(random() * 26)::integer)
    FROM generate_series(1, 40 + b * 0)
  ) AS y(x)
)
FROM generate_series(1,5) as a(b);