EF Core执行迁移的时候出错

可能会遇到的问题：

Both Entity Framework 6.x and Entity Framework Core commands are installed. The Entity Framework 6 version is executing. You can fully qualify the command to select which one to execute, 'EntityFramework\Update-Database' for EF6.x and 'EntityFrameworkCore\Update-Database' for EF Core.

解决方法：