select all records and the rest - php

Question

here is a simple mysqli query to select specific records from my mysql database:
foreach ($getData as $data) { {
$sql = "SELECT * FROM `myTable` WHERE `bookid` = '".$data['ID']."' ";
$result = $db->query( $sql );
while ($zeile = $result->fetch_object()) {
// DO SOMETHING
}
}
The question is:
How can I get (best practices) all the other records, which will not be selected with this query filter?

Answer 1

It can be like
foreach ($getData as $data) { {
$sql = "SELECT * FROM `myTable` WHERE `bookid` = '".$data['ID']."' ";
$result = $db->query( $sql );
while ($zeile = $result->fetch_object()) {
// DO SOMETHING
$query2 = "select * from 'myTable' WHERE 'bookid' != ".$zeile['ID']."'";
$result2 = $db -> query($query2);
// do something...
}
}
OR
foreach ($getData as $data) { {
$sql = "SELECT * FROM `myTable` WHERE `bookid` = '".$data['ID']."' ";
$result = $db->query( $sql );
while ($zeile = $result->fetch_object()) {
// DO SOMETHING
}
$query2 = "select * from 'myTable' WHERE 'bookid' != '".$data['ID']."'";
$result2 = $db -> query($query2);
while($zeile2 = $result2-> fetch_object()){
// do something...
}
}

Answer 2

Running successive, more or less identical, queries in a loop is fundamentally a bad way to do things. Create a list of $data['ID'] values you want to work with, then use one query to retrieve all the rows IN that list, and a second query to retrieve everything NOT IN that list:
Important: This code assumes that the values in $getData[]['ID'] can be trusted. i.e. they have been validated before entry to this code, or they come from a trusted source.
// Create a list:
$inList = '('.implode(',', array_column($getData, 'ID')).')';
$sqlIn = "SELECT * FROM `myTable` WHERE `bookid` IN $inList";
// run the query. Check for errors
if (($result = $db->query( $sqlIn )) === false) {
throw new Exception($db->error);
}
while ($zeile = $result->fetch_object()) {
// DO SOMETHING
}
// Now use the same list to exclude those rows
$sqlOut = "SELECT * FROM `myTable` WHERE `bookid` NOT IN $inList";
// run the query. Check for errors
if (($result = $db->query( $sqlOut )) === false) {
throw new Exception($db->error);
}
while ($zeile = $result->fetch_object()) {
// DO SOMETHING
}