[英]SELECT all rows by WHERE clause
我有以下查詢有效(沒有“ WHERE stats.dt”部分)。 我得到所有用戶的數據。
我的問題是,此查詢當然只對具有stats.dt> $ timestampnow- $ maxdays_data的用戶產生行。 但是我需要所有用戶,但是僅當stats.dt大於tstamp-maxdays時才需要獲取其SUM(上傳)或SUM(下載)的值。 具有stats.dt小於我需要的值的上載和下載值的其他行可以忽略。
一個示例是,由於其dt太小,因此不會選擇節點號為2的用戶。 我確實希望選擇用戶,但不選擇數據或上載值(它們可以為0)。
統計信息表如下所示
nodeid | dt | upload | download
----------------------------------------
1 | 1381699533 | 345345 | 42324234
1 | 1382899152 | 7575 | 574234
1 | 1380699533 | 764534 | 7235232
2 | 1372899152 | 71455 | 124123
我不知道從哪里開始尋找解決方法,所以也許有人可以指出正確的方向。 謝謝!
SELECT b.id, b.lastname, b.name, c.balance, a.maxdebt, b.warndata, b.warndownload, b.warnupload, b.warndebt, b.cutoffdata, b.cutoffdownload, b.cutoffupload, b.cutoffdebt, b.data, b.download, b.upload, b.warning, b.access, b.cutoffstop
FROM (
SELECT customers.id AS id, SUM(tariffs.value) AS maxdebt
FROM tariffs
LEFT JOIN assignments ON tariffs.id = assignments.tariffid
RIGHT JOIN customers ON assignments.customerid = customers.id
GROUP BY id
) a
JOIN (
SELECT customers.id AS id, UPPER(lastname) AS lastname, customers.name AS name, SUM(stats.upload+stats.download) AS data, SUM(stats.download) AS download, SUM(stats.upload) AS upload, customers.cutoffstop, warndata, warndownload, warnupload, warndebt, cutoffdata, cutoffdownload, cutoffupload, cutoffdebt, nodes.warning, nodes.access
FROM customers
LEFT JOIN nodes ON customers.id = nodes.ownerid
LEFT JOIN stats ON nodes.id = stats.nodeid
LEFT JOIN customerwarnings ON customers.id = customerwarnings.id
WHERE stats.dt > ($timestampnow-$maxdays_data)
GROUP BY id
) b ON a.id = b.id
JOIN (
SELECT customerid, SUM(cash.value) AS balance
FROM cash
GROUP BY customerid
) c ON b.id = c.customerid
這是一種蠻力的方法。 幾乎可以肯定它可以簡化,但是如果不了解表和外鍵結構,就很難確定。
我所做的是將sum(stats.download)
替換為sum(case when stats.dt > ($timestampnow-$maxdays_data) then s.download end)
並類似地進行上傳。 我也將b上的聯接更改為外部聯接:
Select
b.id,
b.lastname,
b.name,
c.balance,
a.maxdebt,
b.warndata,
b.warndownload,
b.warnupload,
b.warndebt,
b.cutoffdata,
b.cutoffdownload,
b.cutoffupload,
b.cutoffdebt,
b.data,
b.download,
b.upload,
b.warning,
b.access,
b.cutoffstop
From (
Select
c.id,
sum(t.value) as maxdebt
From
tariffs t
left join
assignments a
on t.id = a.tariffid
right join
customers
on a.customerid = c.id
Group by
c.id
) a left outer join (
Select
c.id,
upper(lastname) as lastname,
c.name,
sum(s.upload + s.download) as data,
sum(case when stats.dt > ($timestampnow-$maxdays_data) then s.download end) as download,
sum(case when stats.dt > ($timestampnow-$maxdays_data) then s.upload end) as upload,
c.cutoffstop,
warndata,
warndownload,
warnupload,
warndebt,
cutoffdata,
cutoffdownload,
cutoffupload,
cutoffdebt,
n.warning,
n.access
From
customers c
left join
nodes n
on c.id = n.ownerid
left join
stats s
on n.id = s.nodeid
left join
customerwarnings w
on c.id = w.id
Group By
c.id
) b
On a.id = b.id
inner join (
Select
customerid,
sum(cash.value) as balance
From
cash
Group By
customerid
) c
on a.id = c.customerid
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