CREATE TABLE teachers (firstname VARCHAR2, lastname VARCHAR2, classroom VARCHAR2)
CREATE TABLE list (classroom VARCHAR2)

Find the name of the teacher who teaches the largest number of students.
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