运行以下代码输出的数据为？（ ）

import sqlite3

connection = sqlite3.connect("students.db")

cursor = connection.cursor()

cursor.execute("CREATE TABLE students (name TEXT, age INTEGER)")

cursor.execute("INSERT INTO students VALUES ('John', 19)")

cursor.execute("INSERT INTO students VALUES ('John', 18)")

cursor.execute("DELETE FROM students WHERE name = 'John'")

cursor.execute("INSERT INTO students VALUES ('John', 17)")

cursor.execute("UPDATE students SET age = 2 WHERE name = 'John'")

cursor.execute("SELECT * FROM students")

results = cursor.fetchall()

for row in results:
print(row)

connection.close()