Field  	Type  	Collation  	Attributes  	Null  	Default  	Extra 
	id 	int(10) 		UNSIGNED 	No 		auto_increment 	
	userid 	int(10) 		UNSIGNED 	No 	0 		
	topicid 	int(10) 		UNSIGNED 	No 	0 		
	lastpostread 	int(10) 		UNSIGNED 	No 	0