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You need not drop down into SQL to create an index — you can simply use a migration.
无需采用SQL创建索引——可以简单地使用迁移创建。
You can easily create an index with your create_table migration, or create an additional migration that creates your index.
可以轻松地使用create _ table迁移创建索引，也可以创建一个额外的迁移来创建索引。
The controllability of process migration is improved further by introducing the migration inertia index.
引入迁移惰性指数，使进程迁移的可控性得到进一步提高。
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