php - PDO 选择倍数 count()

Question

这是我想在 MYSQL_QUERY 中说的话

$query = "SELECT (SELECT COUNT(type) FROM msg WHERE view = 0 AND nd = 'test' AND type = 0) as inbox,
   (SELECT COUNT(type) FROM msg WHERE view = 0 AND nd = 'test' AND type = 1) as sent,
   (SELECT COUNT(type) FROM msg WHERE view = 0 AND nd = 'test' AND type = 2) as draft,
   (SELECT COUNT(type) FROM msg WHERE view = 0 AND nd = 'test' AND type = 3) as spam,
   (SELECT COUNT(type) FROM msg WHERE view = 0 AND nd = 'test' AND type = 4) as trash";

我喜欢使用 PDO，我尝试过这个，但出现错误:

$query=$db->prepare("SELECT 
(SELECT COUNT(*) as inbox FROM msg WHERE view = :view AND nd = :nd AND type = :type),
(SELECT COUNT(*) as sent FROM msg WHERE view = :view AND nd = :nd AND type = :type),
(SELECT COUNT(*) as draft FROM msg WHERE view = :view AND nd = :nd AND type = :type),
(SELECT COUNT(*) as trash FROM msg WHERE view = :view AND nd = :nd AND type = :type)
");
$query->execute(array(
':view' => 0,
':nd' => 'test',
':type' => 1
    ));
$pageRow=$query->fetch(PDO::FETCH_NUM);
$inbox = $pageRow[0];
$sent = $pageRow[1];
$draft = $pageRow[2];
$trash = $pageRow[3];

Answer 1

试试这个查询:

SELECT IFNULL(SUM(type = 0), 0) as inbox,
       IFNULL(SUM(type = 1), 0) as sent,
       IFNULL(SUM(type = 2), 0) as draft,
       IFNULL(SUM(type = 3), 0) as spam,
       IFNULL(SUM(type = 4), 0) as trash
FROM msg
WHERE view = :view AND nd = :nd