sql trees move some element - Mailing list pgsql-general

hi

I have a table:
 id          | integer | not null default
 nextval('public.menu_2_id_seq'::text)
 parent_id   | integer |
 description | text    | not null

how am I able to move some element with id = x before or after
element with id = y ?

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WBR, sector119