SQL First Steps
Examples:
SELECT characters.id_character,characters.name
FROM `characters`
WHERE
characters.id_character IN (1,3)
ORDER BY id_character DESC;
SELECT characters.id_character,characters.name
FROM `characters`
WHERE
characters.id_character=1 OR characters.id_character=3
ORDER BY id_character DESC;
SELECT characters.id_character,characters.name
FROM `characters`
WHERE
characters.id_character=1 AND characters.id_character=3
ORDER BY id_character DESC