Unknown column 'POP' in 'where clause' что за ошибка?

Yevgeniy Kisselyov: Спасибо за ответ. Ошибка исчезла.

Unknown column 'POP' in 'where clause' что за ошибка?

$sql = "SELECT songer_name, song, more, section, id FROM section_song WHERE section=$category";

Unknown column 'POP' in 'where clause' что за ошибка?

<?php

$category = isset($_GET["category"]) ? $_GET["category"] : 1;
echo $category;
echo "
";

$sql = "SELECT songer_name, song, more, section, id FROM section_song WHERE section=$category";

$res = mysqli_query($conn,$sql);
echo mysqli_error($conn);
$p = mysqli_fetch_assoc($res);

?>

<?php
echo $p["song"];
echo '';
echo '';
echo '

"."Songer".$p["songer_name"]."

"."Song".$p["song"]."

"."More Information".$p["more"]."

"."Section ".$p["section"]."

';
echo "";
mysqli_close($conn);
?>