通过PHP从PostgreSQL中选择最新的3个问题

Question

如何通过PHP从PostgreSQL数据库中选择最新3个问题的标题？

我在PHP中的尝试

$result = pg_prepare($dbconn, "query1", "SELECT title FROM 
    questions ORDER BY was_sent_at_time 
    WHERE question_id = $1;");
$result = pg_execute($dbconn, "query1", array(7, 1, 9);     
   // Problem HERE, since I do not know how you can get the 3 newest questions

Answer 1

在MySQL中它看起来像

SELECT title FROM questions ORDER BY was_sent_at_time DESC LIMIT 3;

不确定它是否仍然适用而不改变Postgres.