1  	PRIMARY  	questions  	ref  	PRIMARY,inquiry  	inquiry  	4  	const  	13  	Using where; Using temporary; Using filesort
1 	PRIMARY 	options 	ref 	PRIMARY,question 	question 	4 	samla.questions.id 	3 	Using where
1 	PRIMARY 	answers 	ref 	option_id 	option_id 	4 	samla.options.id 	20 	Using where
2 	DEPENDENT SUBQUERY 	answers 	index_subquery 	response,option_id 	response 	4 	func 	9 	Using index; Using where