Inflector

# JOIN users ON user_id = users.id
join('users')

Having

# HAVING active = 1
having(['active' => 1])

Schema

Rails

array ActiveRecord::Base.connection.tables
array ActiveRecord::Base.connection.columns(table_name)

Laravel

array Schema::getColumnListing($table);
array \DB::connection()->getSchemaBuilder()->getColumnListing("users");