lemmy/migrations/2021-01-26-173850_default_a.../up.sql

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MySQL
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create or replace function generate_unique_changeme()
returns text language sql
as $$
select 'http://changeme_' || string_agg (substr('abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789', ceil (random() * 62)::integer, 1), '')
from generate_series(1, 20)
$$;