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Select query failed:SELECT DISTINCT K2.keyword_category, GROUP_CONCAT(DISTINCT keyword ORDER BY keyword) AS child_list FROM keywords K1, keyword_categories K2 WHERE K2.keyword_category_id = K1.keyword_category_id group by K1.keyword_category_id ORDER BY K1.keyword_category_id
Expression #1 of ORDER BY clause is not in SELECT list, references column 'uacesev_expert_on_europe.K1.keyword_category_id' which is not in SELECT list; this is incompatible with DISTINCT