有些迁移修改不只一个列，形成数据库中单一的逻辑变化。
Some migrations change more than one column to consolidate a single logical change in a database.
当新测试程序的更改发生逻辑变化时，负责验证新程序。
New program of program updates which involved logic change must be properly buyoff.
有些数据库变化要求数据和模式一起变化，有些数据变化要求逻辑变化。
Some database changes require changes in data as well as schema, and some of those data changes require logical changes.
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