如何过滤带有值时间戳的角料表字段？

import pymysql

# 连接到数据库
connection = pymysql.connect(host='localhost',
                             user='username',
                             password='password',
                             db='database_name')

try:
    with connection.cursor() as cursor:
        # 查询语句，过滤带有值的时间戳字段
        sql = "SELECT * FROM table_name WHERE timestamp_field IS NULL OR timestamp_field = '0000-00-00 00:00:00'"
        
        # 执行查询
        cursor.execute(sql)
        
        # 获取查询结果
        results = cursor.fetchall()
        
        # 处理查询结果
        for row in results:
            # 进行相关处理或存储
            
finally:
    # 关闭数据库连接
    connection.close()