我有以下四个表格。我的查询正常工作,除了我需要让字段'AUTHORIZED_VIEWER'和'AUTHORIZED_VIEWER_EMAIL'返回所有值而不仅仅是第一个值。我相信这可以通过使用GROUP_CONCAT来完成,但是,我不确定应该如何实现这部分。 注意 - 尝试使用GROUP_CONCAT时,我必须使用以下语法,因为它返回了一个BLOB:
CONVERT(GROUP_CONCAT(authorized_viewer) USING utf8)
以下是四个表格:
users_tbl
+-----+------------------+
|id |email |
+-----+------------------+
|10 | scott@co.com |
|8 | cesar@co.com |
|11 | kevin@co.com |
|12 | jake@co.com |
+-----+------------------+
authorized_viewers_tbl (authorized_viewer linked to id in users_tbl)
+-----+------------+------------------+
|id |lightbox_id |authorized_viewer |
+-----+------------+------------------+
|1 | 50 |11 |
|7 | 50 |8 |
|3 | 31 |11 |
|5 | 30 |8 |
|6 | 30 |11 |
|8 | 16 |11 |
|9 | 16 |10 |
|10 | 5 |10 |
|11 | 5 |11 |
+-----+------------+------------------+
lightboxes_tbl
+-----+------------------+---------------+
|id |lightbox_name |author |
+-----+------------------+---------------+
|5 | Test Lightbox #1 |jake@co.com |
|16 | Test Lightbox #2 |cesar@co.com |
|30 | Test Lightbox #3 |scott@co.com |
|31 | Test Lightbox #4 |kevin@co.com |
|50 | Test Lightbox #5 |cesar@co.com |
+-----+------------------+---------------+
lightbox_assets_tbl
+-------+-------------+------------------+------------------=---+----------+
|id |lightbox_id |asset_name |asset_path | asset_id |
+-------+-------------+------------------+----------------------+----------+
|232 |30 |b757.jpg |SWFs/b757.jpg | 3810 |
|230 |31 |b757.jpg |SWFs/b757.jpg | 3810 |
|233 |16 |a321_takeoff.jpg |SWFs/a321_takeoff.jpg | 3809 |
|234 |31 |a321_takeoff.jpg |SWFs/a321_takeoff.jpg | 3809 |
|235 |50 |a330_landing.png |SWFs/a330_landing.png | 3789 |
+-------+-------------+------------------+-----------------------+---------+
以下是我目前使用的查询:
SELECT lb.id,
lb.lightbox_name,
lb.author,
avt.authorized_viewer,
u.email AS authorized_viewer_email,
COUNT(lba.lightbox_id) total_assets
FROM lightboxes_tbl lb
LEFT JOIN lightbox_assets_tbl lba ON lb.id = lba.lightbox_id
LEFT JOIN authorized_viewers_tbl avt ON avt.lightbox_id = lb.id
LEFT JOIN users_tbl u ON u.id = avt.authorized_viewer
WHERE lb.author = 'scott@co.com'
OR avt.authorized_viewer =
(SELECT id
FROM users_tbl
WHERE email = 'scott@co.com')
GROUP BY lb.id
ORDER BY lb.lightbox_name ASC
谢谢!
[编辑] 基于SQL Fiddle的预期结果:
+-------+----------------+--------------+-------------------+--------------------------+--------------+
|id |lightbox_name |author |authorized_viewer | email | total_assets |
+-------+----------------+--------------+-------------------+--------------------------+--------------+
|5 |Test Lightbox#1 |jake@co.com |10,11 |scott@co.com,kevin@co.com |0 |
|16 |Test Lightbox#2 |cesar@co.com |10,11 |scott@co.com,kevin@co.com |1 |
|30 |Test Lightbox#3 |scott@co.com |11,8 |kevin@co.com,cesar@co.com |1 |
+-------+-------------+-----------------+-------------------+--------------------------+--------------+
答案 0 :(得分:1)
有一种更清洁的方法可以做到这一点,但我还没有时间思考它。
一个有趣的问题永远不会感谢分享和希望我们帮助过!
group_concat
添加到avt.authorized_viewer
和u.email
distinct
添加到group_concat
,仅按要求撤回唯一值。group by
。group_concat
按需工作。
SELECT lb.id,
lb.lightbox_name,
lb.author,
group_concat(distinct avt.authorized_viewer) a,
group_concat(distinct u.email) b,
COUNT(distinct lba.id) total_assets
FROM lightboxes_tbl lb
LEFT JOIN lightbox_assets_tbl lba ON lb.id = lba.lightbox_id
LEFT JOIN authorized_viewers_tbl avt ON avt.lightbox_id = lb.id
LEFT JOIN users_tbl u ON u.id = avt.authorized_viewer
where lb.author = 'scott@co.com'
or
lb.id in (Select lightbox_ID
from authorized_Viewers_tbl X
INNER JOIN users_Tbl U on U.ID = X.authorized_Viewer
WHERE email = 'scott@co.com')
GROUP BY lb.id, lb.lightbox_name, lb.author
ORDER BY lb.lightbox_name ASC
http://sqlfiddle.com/#!2/ccc6a/2/0 希望这能为你解决问题! (从基础主题中删除了几条评论,因为我现在已将它们包括在内或这里获得的信息。)
答案 1 :(得分:0)
试试这个: -
SELECT lb.id,
lb.lightbox_name,
lb.author,
avt.authorized_viewer,
u.email AS authorized_viewer_email,
COUNT(lba.lightbox_id) total_assets
FROM lightboxes_tbl lb
LEFT JOIN lightbox_assets_tbl lba ON lb.id = lba.lightbox_id
LEFT JOIN authorized_viewers_tbl avt ON avt.lightbox_id = lb.id
LEFT JOIN users_tbl u ON u.id = avt.authorized_viewer
WHERE lb.author = 'scott@co.com'
OR avt.authorized_viewer =
(SELECT id
FROM users_tbl
WHERE email = 'scott@co.com')
GROUP BY lb.id, lb.lightbox_name, lb.author, avt.authorized_viewer, u.email
ORDER BY lb.lightbox_name