Query using Eloquent Laravel using "as" - php

Question

How do you know the other code to get this query in laravel using eloquent?
$variable_value= DB::select(
'SELECT
sv.VARIABLE_NAME as sv_variable_name, sv.TYPE as sv_type, sv.ADDRESS as sv_address, sv.VALUE as sv_value,
ms.VARIABLE_NAME as ms_variable_name, ms.TYPE as ms_type, ms.ADDRESS as ms_address, ms.VALUE as ms_value
FROM MASTER_VARIABLES ms
JOIN SLAVE_VARIABLES sv ON ms.SLV_ADDRESS=sv.ID_VARIABLE'
);
Thank you for your help, guys!

Answer 1

It's all in the documentation. Give it a read?
# Selects
Specifying A Select Clause
You may not always want to select all columns from a database table. Using the select method, you can specify a custom select clause for the query:
$users = DB::table('users')->select('name', 'email as user_email')->get();
# Joins
Inner Join Clause
The query builder may also be used to write join statements. To perform a basic "inner join", you may use the join method on a query builder instance. The first argument passed to the join method is the name of the table you need to join to, while the remaining arguments specify the column constraints for the join. You can even join to multiple tables in a single query:
$users = DB::table('users')
->join('contacts', 'users.id', '=', 'contacts.user_id')
->join('orders', 'users.id', '=', 'orders.user_id')
->select('users.*', 'contacts.phone', 'orders.price')
->get();
$query = DB::table('MASTER_VARIABLES as ms')
->select(
'sv.VARIABLE_NAME as sv_variable_name',
'sv.TYPE as sv_type',
'sv.ADDRESS as sv_address',
'sv.VALUE as sv_value',
'ms.VARIABLE_NAME as ms_variable_name',
'ms.TYPE as ms_type',
'ms.ADDRESS as ms_address',
'ms.VALUE as ms_value'
)
->join('SLAVE_VARIABLES as sv', 'ms.SLV_ADDRESS', '=', 'sv.ID_VARIABLE')
->get();