如何将拼接的列名拆分成单独的列？

import mysql.connector

# 连接到MySQL数据库
cnx = mysql.connector.connect(user='username', password='password',
                              host='localhost', database='database_name')
cursor = cnx.cursor()

# 查询原始表中的拼接列名
query = "SELECT CONCATENATED_COLUMN FROM table_name"
cursor.execute(query)
result = cursor.fetchall()

# 拆分列名并创建单独的列
column_names = result[0][0].split(',')
for column_name in column_names:
    # 创建单独的列
    alter_table_query = "ALTER TABLE table_name ADD COLUMN {} VARCHAR(255)".format(column_name)
    cursor.execute(alter_table_query)

# 将拼接列的数据填充到单独的列中
update_query = "UPDATE table_name SET "
for i, column_name in enumerate(column_names):
    update_query += "{} = SUBSTRING_INDEX(SUBSTRING_INDEX(CONCATENATED_COLUMN, ',', {}), ',', -1), ".format(column_name, i+1)
update_query = update_query.rstrip(', ')
cursor.execute(update_query)

# 提交更改并关闭连接
cnx.commit()
cursor.close()
cnx.close()