如何在另一个表中使用数据类型字符串作为外键制作无主键

Question

I am trying to make a non primary key as foreign key in another table whose datatype is string.I'm trying to reference doctor_id from users table

Referenced Table

Referencing Table

Answer 1

you have to use unique modifier on your column.

$table->string('doctor_id')->unique();

however, if you set nullable as the modifier like:

$table->string('doctor_id')->unique()->nullable();

it will present another problem when it has multiple records with the same value of null .