PHP / SQL give rest of users a value - php

Question

What I did was to give 2 users in my DB a categorie_bit value of 1,
When I click on a button. That works so far. Now I am trying to give the rest of the user a categorie_bit value of 0, if I click on that button.
So basically:
Give 2 Random Users categorie_bit value 1 & Give Rest of the User in DB categorie_bit value of 0.
(Again giving 2 random Users value of 1 works and saves in db.)
I tried this so far to give the rest a value of 0:
$member = $staff->getStaffData($id);
$queryCheck = $database->query('SELECT id,firstname,lastname,categorie_bit FROM `staff` WHERE categorie_bit = 1');
$queryCheckResult = $queryCheck->fetch();
$queryMaximum = $queryCheckResult > 1;
var_dump($queryMaximum); // true
// MY SQL TO GIVE REST A VALUE OF 0
$taste = $database->query('SELECT id,firstname,lastname FROM `staff` WHERE categorie_bit = 1 SET categorie_bit = 0');
if($queryMaximum) {
echo "first step works";
if(is_array($taste) || is_object($taste)) {
echo "second step works";
foreach ($taste as $testx) {
var_dump($testx);
}
} else {
echo "second does not work";
}
}
This did not work. I always get the echo of second does not work.
Can anyone help me:)

Answer 1

The request you perform is wrong.
Either you make a select to retrieve user or you make an update to update user.
If you replace
'SELECT id,firstname,lastname FROM `staff` WHERE categorie_bit = 1 SET categorie_bit = 0'
With :
"UPDATE staff SET categorie_bit = 0 where categorie_bit = 1"
Your data should be updated ;)

Answer 2

you have used SET in SELECT statement which can be used in UPDATE query. Be specific on what you want to query from DB. If you want to update all records with category_bit = 0 then
$taste = $database->query('UPDATE `staff` SET categorie_bit = 0 where categorie_bit = 1');