MYSQL聯接不選擇正確的行

Question

我有兩個表

1）推廣

id profile_id url 
------------------------- 
1 2  www.test.com 
2 3  www.google.com 
3 4  www.example.com 

2）。 outreach_links

id outreach_id end_date    status 
------------------------------------ 
1 1   2016-12-28 00:00:00 Approved 
2 1   2016-12-16 00:00:00 Approved 
3 1   NUll     Pending 
4 1   2016-12-11 00:00:00 Approved 

我有這樣的SQL查詢與左連接和除我要選擇符合條件3的MAX END_DATE的整排被工作正常條件。所以在這種情況下，第一行與END_DATE = 2016年12月28日00:00:00

select o.*,ol.*,MAX(ol.end_date) as max_date, SUM(ol.status = "Approved" and (ol.end_date > Now() or end_date is null)) as cond1, SUM(ol.status = "Pending") as cond2, 
    SUM(ol.status = "Approved" and (ol.end_date < Now() and ol.end_date is not null)) as cond3 
FROM outreach o 
LEFT JOIN outreach_links ol on ol.outreach_id = o.id 
WHERE o.profile_id=2 
GROUP BY o.id 
HAVING (cond1 = 0 and cond2 = 0) or (cond1 = 0 and (cond2 = 1 and cond3 >=1)) 
ORDER BY ol.end_date desc 

但是這是此查詢的輸出（其拾取未決出於某種原因）>>

+"id": "3" 
+"profile_id": "2" 
+"url": "www.test.com" 
+"outreach_id": "1" 
+"end_date": null 
+"status": "Pending" 
+"max_date": "2016-12-28 00:00:00" 
+"cond1": "0" 
+"cond2": "1" 
+"cond3": "3" 

我想這不是

+"id": "1" 
+"profile_id": "2" 
+"url": "www.test.com" 
+"outreach_id": "1" 
+"end_date": 2016-12-28 00:00:00 
+"status": "Approved" 
+"max_date": "2016-12-28 00:00:00" 
+"cond1": "0" 
+"cond2": "1" 
+"cond3": "3" 

第一行與MAX的最後一天，我該怎麼做，保持此相同的查詢？

感謝

Answer 1

見SQL Select only rows with Max Value on a Column如何與最大end_date每個outreach_id獲取該行。然後加入該行以獲取最新狀態。

SELECT o.*, ol1.max_date, ol2.status, SUM(ol.status = "Approved" and (ol.end_date > Now() or end_date is null)) as cond1, SUM(ol.status = "Pending") as cond2, 
    SUM(ol.status = "Approved" and (ol.end_date < Now() and ol.end_date is not null)) as cond3 
FROM outreach o 
LEFT JOIN outreach_links AS ol ON ol.outreach_id = o.id 
LEFT JOIN (SELECT outreach_id, MAX(end_date) AS max_date 
      FROM outreach_links 
      GROUP BY outreach_id) AS ol1 ON ol1.outreach_id = o.id 
LEFT JOIN outreach_links ol2 on ol2.outreach_id = o.id AND ol2.end_date = ol1.max_date 
WHERE o.profile_id=2 
GROUP BY o.id 
HAVING (cond1 = 0 and cond2 = 0) or (cond1 = 0 and (cond2 = 1 and cond3 >=1)) 
ORDER BY ol.end_date desc