选择两个日期之间记录的平均值SQL Netezza

我有两个表，第一个叫做Activations，有两列：Line\u ID，Activation\u Date。 第二个名为Speed的表有以下列：Line_ID、From_Date、To_Date、Record

第一个表格示例：

|Line_ID| Activation_Date|
|-------+----------------|
|123456 | 1-Jan          |
|345678 | 2-Jan          |
|987654 | 3-Jan          |
...

第二个差距和岛屿表：

|Line_ID|From_Date| To_Date |Speed|
|-------+---------+---------+-----|  
|123456 |1-Jan    |4-Jan    |70   |
|123456 |4-Jan    |7-Jan    |51   |
|123456 |7-Jan    |10-Jan   |48   |
|123456 |10-Jan   |15-Jan   |40   |
|123456 |15-Jan   |17-Jan   |70   |
|123456 |17-Jan   |19-Jan   |54   |
|123456 |19-Jan   |21-Jan   |94   |
|123456 |21-Jan   |28-Jan   |91   |
|123456 |28-Jan   |31-Jan   |35   |
...

我需要将激活表与记录表连接起来，以便在激活表中添加4列，但有一些问题

第一个：从激活日期开始的前7天记录的平均速度。 第二个：自激活日期起第二个7天记录的平均速度。 3ed：自激活日期起第三个7天记录的平均速度。 第4天：自激活日期起第4个7天记录的平均速度。 结果如下所示

|Line_ID| Activation_Date|AVG_SPEED_Week1|AVG_SPEED_Week2|AVG_SPEED_Week3|AVG_SPEED_Week4|
|-------+----------------+---------------+---------------+---------------+---------------|
|123456 | 1-Jan          |60.5           |44             |72.6           |91             |
...

结果探索

AVG_SPEED_Week1: Average of Speed in the 1st 7 days starting Records.From_Date: 1-Jan Records.To_Date: 7-Jan
AVG_SPEED_Week2: Average of Speed in the 2nd 7 days starting Records.From_Date: 8-Jan Records.To_Date: 14-Jan
AVG_SPEED_Week3: Average of Speed in the 2nd 7 days starting Records.From_Date: 15-Jan Records.To_Date: 21-Jan
AVG_SPEED_Week4: Average of Speed in the 2nd 7 days starting Records.From_Date: 22-Jan Records.To_Date: 28-Jan

---

我没法测试，但那怎么样

SELECT a.Line_ID
,a.Activation_Date 
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-7,s.To_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week1
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-14,s.To_Date) >= a.Activation_Date AND DATEADD(day,-7,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week2
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-21,s.To_Date) >= a.Activation_Date AND DATEADD(day,-14,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week3
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-28,s.To_Date) >= a.Activation_Date AND DATEADD(day,-21,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week4
FROM Activations a
JOIN Speed s 
ON a.Line_ID=s.Line_ID
GROUP BY a.Line_ID, a.Activation_Date

我假设您不需要动态计算并生成任意周数的平均速度，4周就足够了

---

它肯定需要测试。

我无法测试它，但那怎么样

SELECT a.Line_ID
,a.Activation_Date 
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-7,s.To_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week1
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-14,s.To_Date) >= a.Activation_Date AND DATEADD(day,-7,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week2
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-21,s.To_Date) >= a.Activation_Date AND DATEADD(day,-14,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week3
,CASE WHEN a.Activation_Date >= s.From_Date AND a.Activation_Date <= s.To_Date AND DATEADD(day,-28,s.To_Date) >= a.Activation_Date AND DATEADD(day,-21,s.From_Date) >= a.Activation_Date THEN AVG(SUM(s.Speed)) END AVG_SPEED_Week4
FROM Activations a
JOIN Speed s 
ON a.Line_ID=s.Line_ID
GROUP BY a.Line_ID, a.Activation_Date

我假设您不需要动态计算并生成任意周数的平均速度，4周就足够了

---

它肯定需要测试。

我会扩展数据并聚合：

with s as (
      select s.*, s.from_date + n.idx * interval '1 day' as dte
      from speed s join
           _V_VECTOR_IDX n
           on s.to_date <= s.from_date + n.idx * interval '1 day'
     )
select a.line_id,
       avg(case when s.dte between a.activation_date and a.activation_date + interval '6 day' then s.speed end),
       avg(case when s.dte between a.activation_date  + interval '7 day' and a.activation_date + interval '13 day' then s.speed end),
       avg(case when s.dte between a.activation_date  + interval '14 day' and a.activation_date + interval '20 day' then s.speed end),
       avg(case when s.dte between a.activation_date + interval '21 day' and a.activation_date + interval '27 day' then s.speed end)
from activations a left join
     s
     on a.line_id = s.line_id
group by a.line_id, a.activation_date;

---

这假设时间段少于1000天左右。

我将展开数据并聚合：

with s as (
      select s.*, s.from_date + n.idx * interval '1 day' as dte
      from speed s join
           _V_VECTOR_IDX n
           on s.to_date <= s.from_date + n.idx * interval '1 day'
     )
select a.line_id,
       avg(case when s.dte between a.activation_date and a.activation_date + interval '6 day' then s.speed end),
       avg(case when s.dte between a.activation_date  + interval '7 day' and a.activation_date + interval '13 day' then s.speed end),
       avg(case when s.dte between a.activation_date  + interval '14 day' and a.activation_date + interval '20 day' then s.speed end),
       avg(case when s.dte between a.activation_date + interval '21 day' and a.activation_date + interval '27 day' then s.speed end)
from activations a left join
     s
     on a.line_id = s.line_id
group by a.line_id, a.activation_date;

---

这假设时间段少于1000天左右。

我不理解第二个表。持续时间总是一天吗？@GordonLinoff我将第二张表的样本编辑为gaps and Island我不理解第二张表。持续时间总是一天吗？@GordonLinoff我已经将第二个表的示例编辑为gaps和Islandi，我应用了上面提到的代码，但没有给出真正的结果。如果线路ID的有效日期为2020-08-19，那么第一个平均值的起始日期和截止日期是什么？为什么DTE列在From之后2天_Date@AhmedAbdelkader . . . 我的理解是，这应该是你想要的，但也许你需要加减一天才能得到准确的结果。我应用了上面提到的代码，但它没有给我真正的结果。如果线路ID的有效日期为2020-08-19，那么第一个平均值的起始日期和截止日期是什么？为什么DTE列在From之后2天_Date@AhmedAbdelkader . . . 我的理解是，这应该是你想要的，但也许你需要增加或减少一天来获得确切的结果。