插入值在mysqli中不起作用

Question

I have created two tables, employee and department. Now, in the department table, I assigned a foreign key and a PK is assigned for the employee table. If view data, Ii can join the table.

How to write the query in PHP for insert and update?

My query:

?php
include "connect.php";
if(isset($_POST["submit"]))
{
    $fname  = $_POST["fname"];
    $dept   = $_POST["dept"];


    $result = mysqli_query($mysqli, "INSERT INTO employee ( fname, department)
            (SELECT fname, department FROM employee LEFT JOIN department ON employee.id=department.dept_id) values ( '$fname', '$dept')");

    if($result)
        {
            echo "<script>alert('New employee register successfully!')</script>";
            echo "<script>window.open('register.php','_self')</script>";
        }
    else 
        {
            echo "<script>alert('something went wrong!')</script>";
        }
    }
?>

Answer 1

$result = mysqli_query($mysqli, "INSERT INTO employee (`fname`, `dept`)
VALUES ('$fname','$dept')");
if($result)
    {
        echo "<script>alert('New employee register successfully!')</script>";
        echo "<script>window.open('register.php','_self')</script>";
    }

// You Forget ( `` ) sign in values