(Dab)pages without outgoing links to primary topic

SQL

with article_redirect as (
  select page_title, rd_title from page
  join redirect on page_id = rd_from and rd_namespace = 0
  where page_namespace = 0 and page_is_redirect = 1
)

(select p1.page_title as disamb_title, p2.page_title as primary_topic from page p1
join page p2 on p2.page_namespace = 0 and p2.page_is_redirect = 0
and p2.page_title = substring(p1.page_title, 1, INSTR(p1.page_title, "_(disambiguation)")-1)
where p1.page_title like '%\_(disambiguation)' and p1.page_namespace = 0 and p1.page_is_redirect = 0
and not exists (
  select 1 from pagelinks where pl_from = p1.page_id and pl_namespace = 0 and pl_from_namespace = 0
  and (pl_title = p2.page_title or pl_title in (
    select ar1.page_title from article_redirect ar1 where ar1.rd_title = p2.page_title
  ))
))
union
(select p1.page_title as disamb_title, ar1.rd_title as primary_topic from page p1
join article_redirect ar1 on ar1.page_title = substring(p1.page_title, 1, INSTR(p1.page_title, "_(disambiguation)")-1)
where p1.page_title like '%\_(disambiguation)' and p1.page_namespace = 0 and p1.page_is_redirect = 0
and not exists (
  select 1 from pagelinks where pl_from = p1.page_id and pl_namespace = 0 and pl_from_namespace = 0
  and (pl_title = ar1.rd_title or pl_title in (
    select ar2.page_title from article_redirect ar2 where ar2.rd_title = ar1.rd_title
  ))
))
SQL

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