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Die Abfrage SELECT pm1.meta_value as word,pm2.approved as count FROM iWXE1_postmeta pm1 JOIN ( SELECT pm.post_id, SUBSTRING_INDEX(SUBSTRING_INDEX(pm.meta_key, '_', 4), '_', -1) AS index_value, meta_value as approved FROM iWXE1_postmeta pm WHERE pm.meta_key LIKE 'word_cloud_suggestions_%_word_cloud_suggestions_approved' AND pm.meta_value=1 ) AS pm2 ON pm1.post_id = pm2.post_id WHERE pm1.meta_key LIKE CONCAT('word_cloud_suggestions_', pm2.index_value, '_word_cloud_suggestions_topic') AND pm1.post_id='13808' ORDER BY `meta_id` ASC; liefert kein Ergebnis zurück