![](/img/trans.png)
[英]Select all columns from one table and one from another where column equals variable
[英]mysql - Select all from one table and one column form another where $var is found
Ooooookay。 我有兩個表客戶端和用戶。 兩者都具有AUTO_INCREMENT ID,但客戶端表具有可信列,這是外鍵,並且引用了用戶表的ID。
我想准備一個PHP PDO語句,該語句從客戶端表中獲取所有列,並且僅從用戶表中獲取用戶名列,其中客戶端表的列credid =:var和用戶表的列id =:var
到目前為止,我有這樣的事情,它不起作用
$userid = $_SESSION['id']; //echoes a number
$STH = $DBH->prepare("SELECT * FROM client WHERE credid = :id AND username FROM users
WHERE id = :id");
$credentials = array(
':id' => $userid
);
$STH->execute($credentials);
然后這樣
if ($STH->rowCount() > 0) {
$result = $STH->fetch(PDO::FETCH_ASSOC);
echo $result['columnfoo'];
echo $result['anothercolumn'];
echo etc.
.
.
.
}
這將返回有關sql語法的錯誤。
我也嘗試過這樣的事情:
SELECT client.*,users.username FROM client,users WHERE client.credid =users.id = :id
不返回錯誤,但也不返回任何數據...我應該如何構造准備好的查詢?
您需要使用join
:
SELECT c.*, u.username
FROM client c
JOIN users u ON u.id = c.credid
WHERE credid = :id
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.