[英]mysql join 4 tables with last multiple group by and where class
I have database for delivery of items to customers. 我有用于将项目交付给客户的数据库。 for this i have 4 tables, delivery_logs, delivery,driver,customer
为此,我有4个表,delivery_logs,delivery,driver,customer
(we have delivery log table cause some time one delivery have many entries like not delivered & other driver take delivery etc) (我们有交付日志表,因为一段时间内一次交付有很多条目,例如未交付和其他驱动程序接受交付等)
delivery_log
id delivery_id driver_id message date_added
1 1 1 OK 2016-09-13 17:38:15
2 2 2 OK 2016-09-13 17:35:18
3 1 1 Not OK 2016-09-13 17:33:10
4 1 3 OK 2016-09-13 17:32:13
5 2 4 waiting 2016-09-13 17:20:11
delivery
delivery_id customer_id name status
1 1 delivery 1 done
2 1 delivery 2 done
3 2 delivery 3 done
driver
driver_id name
1 driver1
2 driver2
3 driver3
customer
customer_id first_name last_name
1 name1 other name1
2 name2 other name2
3 name3 other name3
4 name3 other name4
now i want to have query of 现在我想查询
last 1 record (order by date_added) from delivery_log
交货日志中的最后1条记录(按日期添加的顺序)
for each delivery by each driver
每个司机的每次送货
where delivery= done
交货=完成
and i want to have bellow fields 我想拥有风箱
delivery_log.delivery_id delivery_log.driver_id delivery_log.message date_added
delivery.name driver.name
customer.first_name customer.last_name
i have tried many inner join and join options but nothing seems to be working, some time it did't take last record & some time it mix (wrong) the delivery or driver name. 我尝试了许多内部联接和联接选项,但似乎没有任何效果,有一段时间没有上次记录,有一段时间混合(错误)交货或驱动程序名称。
Thanks for all help. 感谢您的所有帮助。
You can use NOT EXISTS()
and JOIN
: 您可以使用
NOT EXISTS()
和JOIN
:
SELECT
dl.*,
del.name,
dr.name,
c.first_name,
c.last_name
FROM delivery_log dl
JOIN delivery del
ON(dl.delivery_id = del.delivery_id)
JOIN driver dr
ON(dr.driver_id = dl.driver_id)
JOIN customer c
ON(del.customer_id = c.customer_id)
WHERE del.status IN('DONE','OK')
AND NOT EXISTS(SELECT 1 FROM delivery_log s
WHERE s.delivery_id = dl.delivery_id
AND s.driver_id = dl.driver_id
AND s.date_added > dl.date_added)
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