CREATE TABLE teachers (lastname CLOB, firstname CLOB, classroom NUMBER)
CREATE TABLE list (lastname CLOB, firstname CLOB, grade NUMBER, classroom NUMBER)

Which teacher teaches the most students? Give me the first name and last name of the teacher.
SELECT T2.firstname, T2.lastname FROM list AS T1 JOIN teachers AS T2 ON T1.classroom = T2.classroom GROUP BY T2.firstname, T2.lastname ORDER BY COUNT(*) DESC LIMIT 1
SELECT "T2"."firstname", "T2"."lastname" FROM "list" "T1" JOIN "teachers" "T2" ON "T1"."classroom" = "T2"."classroom" GROUP BY "T2"."firstname", "T2"."lastname" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY