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 classroom ,  count(*) FROM list WHERE grade  =  "0" GROUP BY classroom
For each grade 0 classroom, return the classroom number and the count of students.