数据库共有5000多条数据，每30条插入一个时间（共有180个时间）如何写php或者mysql的语句

数据库共有5000多条数据，每30条插入一个时间（共有180个时间）怎么写php或者mysql的语句？
数据库共有5000多条数据，每30条插入一天（共有180天）怎么写php或者mysql的语句？

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