SELECT summary FROM cms_module_cgblog WHERE cgblog_id=(SELECT article_id FROM cms_module_cgblog_tags_link WHERE tag_id=979 DESC LIMIT 1);
Why is this request incorrect?
MySQL answer: Documentation
For sorting in descending order you need to use: ORDER BY keyword
Your query should be like this -
SELECT summary FROM cms_module_cgblog WHERE cgblog_id=(SELECT article_id FROM cms_module_cgblog_tags_link WHERE tag_id=979 ORDER BY tag_id DESC LIMIT 1);