SQL：自动插入另一个表中的值

Question

I have two tables the first one is "student":

    id (PK) "auto_inc"
    student_name
    email

The second one is "bill":

    id (PK) "auto_inc"
    student_id (FK -> id)
    total_balance

I am trying to auto-insert the last 'id' into 'student_id' when I add a new student in the same query. This is my query to add a new student to the table

insert into student (name, major, emailAddress)
   values ( :name, :major, :emailAddress )

For example:

id= 1
student_name= "Mike"
email= "mike@mail.com"

bill table:
id= 1
student_id= 1 "from 'student' table"
total_balance= 100

I do not have much experience with SQL DB, I am recently using it.

Answer 1

I can advice next approach:

1. create table student with unique key email

create table student (
  id int primary key auto_increment,
  student_name varchar(255),
  email varchar(255) unique key
);

2. use next PHP code:

<?php

$name = "Barry Block";
$email = "barry.b@gmail.com";
$balance = 500;

$student_sql = "
    insert into student (student_name, email)
    values ( :name, :emailAddress )";

$stmt = $pdo->prepare($student_sql);
$stmt->execute([':name'=>$name, ':emailAddress'=>$email]);

$bill_sql = "
    insert into bill (student_id, total_balance)
    select id, :balance from student where email = :emailAddress";

$stmt = $pdo->prepare($bill_sql);
$stmt->execute([':balance'=>$balance, ':emailAddress'=>$email]);

Test MySQL & PHP code online