[英]MYSQL Query Select with condition & Join
我有這3個表(具有這些結構):
outreach
id url profile_id
------------------------------------------
40 www.google.com 2
41 www.yahoo.com 3
42 www.test.com 1
outreach_links
id outreach_id end_date status
-----------------------------------------------
1 41 2016-01-12 Pending
2 40 2016-03-12 Pending
3 40 2016-02-12 Approved
comments
id outreach_id name
----------------------------
1 40
2 40
3 40
我有這個查詢:
select o.*,
SUM(if(ol.status = "Approved" and (ol.end_date > now() or end_date is null), 1, 0)) as cond1,
SUM(if(ol.status = "Pending" and (ol.end_date != now() or end_date is null), 1, 0)) as cond2,
SUM(if(ol.status = "Pending" and (ol.end_date < now()), 1, 0)) 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
我正在嘗試修復此查詢,並使其也選擇以下內容:
1). ol.* ONLY if MAX(end_date) and
2). Count(id.comment) count all comments for that particular row
那可能嗎?
現在這里是輸出
+"id": "40"
+"profile_id": "2"
+"url": "http://www.google.com"
+"created_at": "2016-12-05 21:55:10"
+"updated_at": "2016-12-05 22:49:56"
+"cond1": "0"
+"cond2": "0"
+"cond3": "5"
我要添加
+"max_date": get me max of end_date and the whole row of the row highlighted
+"Count(comments)": get me all the comments count for this one which is 3
謝謝
您是否要獲取最新的更新日期? 以下查詢應為您提供最新的更新日期。
但是,我不明白您要為cond1,cond2,cond3嘗試獲得什么,應將什么填充為created_date和updated_date? 您能為這些字段給出定義嗎?
SELECT o.*, ol.*, COUNT(c.id)
FROM outreach o
LEFT JOIN outreach_links ol ON ol.outreach_id = o.id
LEFT JOIN comments c ON c.outreach_id = o.id
WHERE ol.id = (SELECT ol2.id
FROM outreach_links ol2
WHERE ol2.outreach_id = ol.outreach_id
ORDER BY ol2.end_date, ol2.id DESC
LIMIT 1)
OR ol.id IS NULL
GROUP BY o.id, ol.id
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