尝试根据哪个月属于哪个季度的定义来累加月度值(以便可以更新定义):

mysql - 根据季度定义累加每月值-LMLPHP

我正在尝试使用内部联接来实现,但失败了:

SELECT qr, sum(price)
INTO Table3
FROM Table1
INNER JOIN Table2
on Table1.mth = Table2.mth
INNER JOIN Table3
on Table2.qr = Table3.qr


另外我不确定在Table1(qr)中增加一列是否会使事情变得容易些?

最佳答案

如果您的table3已经开始有这4行,而您只想更新table3中的价格以反映每个季度的价格,则可以使用以下查询:

UPDATE Table3 T3,
  (SELECT T2.qr,sum(T1.price) as quarterly_price
   FROM Table1 T1
   INNER JOIN Table2 T2 ON T1.mth = T2.mth
   GROUP BY T2.qr) AS Result
SET T3.price = Result.quarterly_price
WHERE T3.qr = Result.qr;


sqlfiddle to Update Table3

如果table3没有这4行,并且您想插入它们,请使用以下查询:

INSERT INTO Table3
  SELECT T2.qr,sum(T1.price) as quarterly_price
   FROM Table1 T1
   INNER JOIN Table2 T2 ON T1.mth = T2.mth
   GROUP BY T2.qr;


sqlfiddle to Insert into Table3

编辑:我可以从您的代码中进行一些修改,这在Access的查询中效果很好:

SELECT Table2.qr,sum(Table1.price) as Price_new
INTO Table3
FROM Table1
INNER JOIN Table2 ON Table1.mth = Table2.mth
GROUP BY Table2.qr;

关于mysql - 根据季度定义累加每月值,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/36659943/

10-13 02:01