[RUBY] Adding columns in Rails

Add column

Add new column (basic) $ rails g migration (process to be performed + table name) (column and data type you want to add, etc.)

$rails g migration AddColumnToUsers  name:string age:integer

Add index to new column

$rails g migration AddColumnToUsers name:string:index

Delete column

string

Create columns at the same time as creating tables

$rails g migration CreateUsers name:string age:integer

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