如何将单个日期列联接到时间范围表

Question

表1表列如下：

cancel_date    product  total_cancels
6/1/2017       a        100
6/1/2017       b        40
6/2/2017       b        10
6/3/2017       b        20
.
.
.
6/1/2018       a        40
6/1/2018       b        10

表2

realdate
6/1/2017
6/2/2017
6/3/2017
.
.
.
6/1/2018

我想要得到的

product    realdate      total_cancels   cancel_date
a          6/1/2017       100000         6/1/2016-4/30/2017
b          6/1/2017       8000           6/1/2016-4/30/2017
a          6/2/2017       100000         6/2/2016-5/1/2017
b          6/2/2017       8000           6/2/2016-5/1/2017
...

所以基本上用realdate对total_cancels求和，对于每个realdate，我需要将canceldate分组2-12个月。

Answer 1

使用聚合函数sum .but，这很奇怪，你显示输出取消日期列的方式就是这样。我想那是你的打字错误

    select t1.product, t2.realdate, sum(t1.total_cancels) as total_cancels   
    from Table1 t1 inner join Table2 t2 on date(t1.cancel_date)=date(t2.realdate)
    group by t1.product, t2.realdate 

Answer 2

还没有测试过，但可能会有帮助？

select t1.product, t2.realdate, sum(t1.total_cancels) 
from t1 join t2 on t1.cancel_date=t2.realdate
group by t1.product, t2.realdate 

我不太明白你在最后一篇专栏里想要什么。这只是根据每个total_cancels的realdate对product进行分组。

Answer 3

似乎这个问题和我在这里回答的问题是一样的：join start_date and _end_date to another table and sum up

您要做的是将table_2连接到table_1，使用on条件，使table_1. cancel_date位于table_2.cancel_start_date和table_2.cancel_end_date之间。但首先我们需要使用DATE_PARSE函数来使日期具有可比性。最后，只需总结这些值。

SELECT
  table_1.product,
  table_2.realdate,     
  SUM(total_cancels) AS total_cancels,   
  CONCAT(table_2.cancel_start_date, '-', table_2.cancel_end_date) as start_to_end
FROM table_1 
JOIN table_2
WHERE DATE_PARSE(table_1. cancel_date, '%m/%d/%Y') 
  BETWEEN DATE_PARSE(table_2.cancel_start_date, '%m/%d/%Y') 
   AND DATE_PARSE(table_2.cancel_end_date, '%m/%d/%Y') 
GROUP BY 1, 2, 4