Let's say that dave has second thoughts and no longer wishes to have starred alice's status update. We can just as easily remove his name from the list:
UPDATE "user_status_updates" SET "starred_by_users" = "starred_by_users" - {'dave'} WHERE "username" = 'alice' AND "id" = 76e7a4d0-e796-11e3-90ce-5f98e903bf02;
This is identical to our previous query, except that we use a - operator to indicate removal rather than a + operator to indicate addition.
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