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。
The foregone achievements show the physical properties and the geochemistry characters of oil and gas can be used as the main index of its migration.
已有的研究表明，油气的物性参数、地球化学特征以及储层的地球化学特征等都可以作为油气运移的示踪指标。
The foregone achievements show the physical properties and the geochemistry characters of oil and gas can be used as the main index of its migration.
已有的研究表明，油气的物性参数、地球化学特征以及储层的地球化学特征等都可以作为油气运移的示踪指标。
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