运行以下Python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 = 22 WHERE name = 'John'")
cursor.execute("SELECT * FROM students")
results = cursor.fetchall()
for row in results:
print(row)
connection.close()
('John', 22)
('John', 18)
('John', 19)
('John', 17)