给定Python操作SQLite的代码，执行score>=90的条件查询后，students表返回的结果包含多少名学生？
import sqlite3
conn = sqlite3.connect(":memory:")
cursor = conn.cursor()
cursor.execute("""
CREATE TABLE students (
id INTEGER PRIMARY KEY,
name TEXT NOT NULL,
score INTEGER NOT NULL
);
""")
cursor.execute("INSERT INTO students (name, score) VALUES ('小明', 90)")
cursor.execute("INSERT INTO students (name, score) VALUES ('小芳', 85)")
cursor.execute("INSERT INTO students (name, score) VALUES ('轩轩', 92)")
cursor.execute("INSERT INTO students (name, score) VALUES ('乐乐', 88)")
conn.commit()
cursor.execute("SELECT * FROM students WHERE score >= 90")
result = cursor.fetchall()
conn.close()
print(result)