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我想執行一個查詢,我可以得到一個列的總和基於where子句和組日期,但它不像我會期望和不知道爲什麼。如何返回基於使用的地方和集合的多個結果
我有交易的一個表:
時間戳(TRANSACTION_DATE)
的值(量),
一個類型(婚前或支出),
透水平衡之前交易(進行),
和期末餘額(餘額)。
這裏是我的表的JSON出口:
[
{
"id":"2",
"type":"payout",
"carry":"2340",
"amount":"50",
"balance":"2290",
"transaction_date":"2014-09-15 00:00:00",
},
{
"id":"1",
"type":"payin",
"carry":"340",
"amount":"2000",
"balance":"2340",
"transaction_date":"2014-09-22 09:10:03",
},
{
"id":"3",
"type":"payout",
"carry":"0",
"amount":"50",
"balance":"0",
"transaction_date":"2014-09-22 09:10:03",
},
{
"id":"4",
"type":"payin",
"carry":"1",
"amount":"30",
"balance":"1",
"transaction_date":"2014-09-22 09:10:03",
}
]
我試圖做到的,是讓每個日期單行(日曆日期,而不是一個時間戳),其中包含:
日期之前任天交易的(再次日曆不時間戳),
初始攜帶,
總和Payins的那天,
和支出的那天,
一天,最終收盤平衡。
目前我只得到一個結果,它似乎忽略由組(均payins和所有支出相加,無論行日期)
SELECT DATE(`transaction_date`) as day,
SUM(amount) AS pay_in
FROM transactions
WHERE type='payin' GROUP BY day
這是我使用的是完整的查詢(減去進和平衡)
SELECT payins.day, payins.pay_in, payouts.pay_out
From
(SELECT DATE(`transaction_date`) as day,
SUM(amount) AS pay_in FROM transactions
WHERE type='payin' GROUP BY DATE(`transaction_date`)
) payins
LEFT JOIN
(SELECT DATE(`transaction_date`) as day, SUM(amount) AS pay_out
FROM transactions
WHERE type='payout'
GROUP BY DATE(`transaction_date`)
) payouts
ON payins.day = payouts.day
Group By day
如果它讓我使用MAMP 3.0.4在OSX 10.9