SQL-如何在另一個表中使用選定的ID？

Question

SQL表：
用戶= ID，名稱，電子郵件..
英雄= ID，名稱，等級
所有者=用戶ID，類Heroid

我有以下兩個查詢：

$result = mysql_query("SELECT heroid FROM owner WHERE userid='$id'"); 
$heroid=mysql_fetch_row($result); 
$result2 = mysql_query("SELECT name FROM hero WHERE ID = 'heroid[0]'");

$heroname = mysql_fetch_row($result2);
echo "User $id has a character named $heroname[0]";
$heroname = mysql_fetch_row($result2); 
echo "User $id has a character named $heroname[0]";
..

可以通過單個查詢完成嗎？

Answer 1

是。 你可以做：

SELECT h.name
FROM hero h
INNER JOIN owner o ON o.heroid = h.id
WHERE o.userid = $id