What is wrong in Laravel request code?

Question

Laravel

Hello.
There is a code

$code = 'TEXT'
DB::table('coupons')
->where('code', $code)
->select('coupons.active',  'coupons.created_at')
->toSql();

as a result I get a SQL query string like

select `coupons`.`active`, `coupons`.`created_at` from `coupons` where `code` = ?

for some reason, instead of a variable, the value of it is not substituted.
Maybe I'm doing something wrong?
Poke your nose into the error please)

Answer 1

Everything is correct. It uses PDO with placeholders ( prepared queries ).
Instead of ? TEXT will be substituted when the request goes to Mysql.

Answer 2

Because it will be substituted by the mysql server.