use a variable for table name in mysql sproc

by 
SET @cname:='jello';
SET @vname:='dwb';
SET @sql_text = concat('select concept_id,concept_name,',@vname,' from enc2.concept a JOIN enc2.ratings b USING(concept_id) where concept_name like (''%',@cname,'%'') and 3 is not null order by 3 asc');

PREPARE stmt FROM @sql_text;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

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