zhwiki: talk exist but main not exist

SQL

/*SET @ns = 14;*/
/*SET @nsn = "分類討論";*/
CREATE FUNCTION `nsname`(`ns` INT) RETURNS VARCHAR(255)
BEGIN
  RETURN case
          when ns = 0 then ""
          when ns = 1 then "Talk:"
          when ns = 2 then "User:"
          when ns = 3 then "User talk:"
          when ns = 4 then "Wikpeida:"
          when ns = 5 then "Wikpeida talk:"
          when ns = 6 then "File:"
          when ns = 7 then "File talk:"
          when ns = 8 then "Mediawiki:"
          when ns = 9 then "Mediawiki talk:"
          when ns = 10 then "Template:"
          when ns = 11 then "Template talk:"
          when ns = 12 then "Help:"
          when ns = 13 then "Help talk:"
          when ns = 14 then "Category:"
          when ns = 15 then "Category talk:"
          when ns = 100 then "Portal:"
          when ns = 101 then "Portal talk:"
          when ns = 118 then "Draft:"
          when ns = 119 then "Draft talk:"
          when ns = 828 then "Module:"
          when ns = 829 then "Module talk:"
          end
END;
USE zhwiki_p;
SELECT
	CONCAT("https://zh.wikipedia.org/w/index.php?title=",nsname(page.page_namespace+1),":", page.page_title, "&redirect=no ") AS "talk link",
	CONCAT(nsname(page.page_namespace+1),":", page.page_title) AS "talk"
FROM page
LEFT JOIN page AS page2 ON page.page_title = page2.page_title AND page.page_namespace = page2.page_namespace+1
WHERE /*page.page_namespace = (@ns+1)
    AND*/ page.page_title NOT LIKE "%/%"
    AND page2.page_title IS NULL
SQL

Checking query status...
