discourse/db/migrate/20160514100852_remove_inval...

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class RemoveInvalidTopicUser < ActiveRecord::Migration[4.2]
2016-05-14 12:34:03 -04:00
def up
execute <<-SQL
DELETE FROM topic_users
USING topic_users tu
LEFT JOIN users u ON u.id = tu.user_id
WHERE u.id IS NULL
AND topic_users.id = tu.id
SQL
end
def down
end
end