zhwiki: talk exist but main not exist

SQL

USE zhwiki_p;
SELECT CONCAT("[https://zh.wikipedia.org/w/index.php?title=", page.page_title, "&redirect=no ", page.page_title, "]") AS "main",
	CONCAT("[https://zh.wikipedia.org/w/index.php?title=Talk:", page.page_title, "&redirect=no ", page.page_title, "] [[Talk:", page.page_title, "]]") AS "talk"
FROM page
LEFT JOIN page AS page2 ON page.page_title = page2.page_title AND page.page_namespace = 5 AND page2.page_namespace = 4
WHERE page.page_namespace = 5
    AND page.page_title NOT LIKE "%/%"
    AND page2.page_title IS NULL
#LIMIT 100

SQL

Checking query status...