CREATE TABLE "list" ( 
	"LastName" TEXT, 
	"FirstName" TEXT, 
	"Grade" INTEGER, 
	"Classroom" INTEGER,
	PRIMARY KEY(LastName, FirstName)
)

CREATE TABLE "teachers" ( 
	"LastName" TEXT, 
	"FirstName" TEXT, 
	"Classroom" INTEGER,
	PRIMARY KEY(LastName, FirstName)
)
SELECT grade ,  count(DISTINCT classroom) ,  count(*) FROM list GROUP BY grade
For each grade, return the grade number, the number of classrooms used for the grade, and the total number of students enrolled in the grade.