查询问题符合条件加入

Question

我有这个疑问这有助于我获得点当前用户，现在，我对设置条件的问题...

$query4 = 'SELECT u.*, SUM(c.ts) AS total_sum1, SUM(r.bv) AS total_sum 
FROM users u 
LEFT JOIN 
(SELECT user_id ,SUM(points) AS ts FROM coupon GROUP BY user_id) c 
ON u.user_id=c.user_id AND u.user_id="'.$_SESSION['user_name'].'" 
LEFT JOIN 
(SELECT user_id ,SUM(basket_value) AS bv FROM retailer GROUP BY user_id) r 
ON u.user_id=r.user_id 
GROUP BY u.user_id'; 

我的问题是AND u.user_id="'.$_SESSION['user_name'].'"

我需要找到这个特定用户的积分.. 我在做错了吗？我的意思是，我知道我是，但什么？ 感谢

Answer 1

写这样的查询

$query4 = 'SELECT u.*, SUM(c.ts) AS total_sum1, SUM(r.bv) AS total_sum 
FROM users u 
LEFT JOIN 
(SELECT user_id ,SUM(points) AS ts FROM coupon GROUP BY user_id) c 
ON u.user_id=c.user_id 
LEFT JOIN 
(SELECT user_id ,SUM(basket_value) AS bv FROM retailer GROUP BY user_id) r 
ON u.user_id=r.user_id 
where u.user_id="'.$_SESSION['user_name'].'" 
GROUP BY u.user_id';