我需要根据日期和2个值添加2个表。
这给了我所有信息的列表 - 很好。
$query = (SELECT date, debit, credit , note FROM proj3_cash )
UNION
(SELECT settle, purch, sale, issue FROM proj3_trades)
ORDER BY date";
现在我需要从两个表格中分组每日总计的信息。
$query = "(SELECT date, SUM(debit), SUM(credit)FROM proj3_cash GROUP BY date)
UNION
(SELECT settle as date, SUM(purch) as debit, SUM(sale) as credit FROM proj3_trades GROUP BY date)
ORDER BY date";
很好,但是如果每张桌子上的同一天有什么东西我就明白了:
date SUM(debit) SUM(credit)
--------------------------------------
2010-12-02 0.00 170.02
2010-12-02 296449.91 233111.10
如何将两者分组到同一天?
如果我在最后添加GROUP BY - 我只会收到错误。或者应该通过JOIN来完成?
答案 0 :(得分:17)
您可以使用派生表来实现此目的:
SELECT date, SUM(debit), SUM(credit)
FROM
(
SELECT date, debit, credit
FROM proj3_cash
UNION ALL
SELECT settle as date,
purch as debit,
sale as credit
FROM proj3_trades
) derivedTable
GROUP BY date
ORDER BY date
我已将UNION更改为UNION ALL,因为union将消除两个表中找到的重复项。