id  	 select_type  	 table  	 type  	 possible_keys  	 key  	 key_len  	 ref  	 rows  	 Extra
1 	SIMPLE 	responses 	ALL 	NULL 	NULL 	NULL 	NULL 	1159 	Using where; Using temporary; Using filesort
1 	SIMPLE 	options 	ALL 	NULL 	NULL 	NULL 	NULL 	391 	Using where
1 	SIMPLE 	answers 	ref 	response,option_id 	response 	4 	samla.responses.id 	4