Oracle10g oracle中的多左连接
你好,我是建筑查询。添加第二个左连接后会产生问题:- 它在添加第二个联接之前工作正常。你能解决这个问题吗Oracle10g oracle中的多左连接,oracle10g,Oracle10g,你好,我是建筑查询。添加第二个左连接后会产生问题:- 它在添加第二个联接之前工作正常。你能解决这个问题吗 SELECT u.dept_name AS deptname, u.user_name AS username, u.user_id AS userid, u.single_id AS singleid, u.email_address AS emailaddress, to_char(m.cur_week_hits) AS empno, to_char(m.prev_week_h
SELECT u.dept_name AS deptname, u.user_name AS username,
u.user_id AS userid, u.single_id AS singleid,
u.email_address AS emailaddress, to_char(m.cur_week_hits) AS empno,
to_char(m.prev_week_hits) AS mobiletelno,r.role_id , r.role_name
to_char(m.cur_week_hits - m.prev_week_hits) AS comptelno
FROM tn_cf_user u
LEFT JOIN
(
SELECT
SUM (cur_week_hits) AS cur_week_hits,
SUM (prev_week_hits) AS prev_week_hits,
user_id
FROM pp
GROUP BY user_id ) m
ON u.user_id = m.user_id
LEFT JOIN
(
SELECT ur.role_id , rn.role_name , ur.user_id
FROM tn_cf_user_role ur , tn_cf_role rn
WHERE ur.role_id = rn.role_id
) r,
ON u.user_id = r.user_id
AND u.single_id IS NOT NULL
AND u.user_type IS NULL
谢谢请尝试一下:
在第二次加入中,更改为m.user\u id=r.user\u id