SQL在数据集中查找最小和最大范围答案

【问题标题】：SQL find min & max range within datasetSQL在数据集中查找最小和最大范围
【发布时间】：2010-12-29 07:03:25
【问题描述】：

我有一个包含以下列的表格：

contactId  (int)  
interval   (int)  
date (smalldate)

小样本数据：

1,120,'12/02/2010'  
1,121,'12/02/2010'  
1,122,'12/02/2010'  
1,123,'12/02/2010'  
1,145,'12/02/2010'  
1,146,'12/02/2010'  
1,147,'12/02/2010'  
2,122,'12/02/2010'  
2,123,'12/02/2010'  
2,124,'12/02/2010'  
2,320,'12/02/2010'  
2,321,'12/02/2010'  
2,322,'12/02/2010'  
2,450,'12/02/2010'  
2,451,'12/02/2010'

如何/是否有可能 - 让 sql 返回列“contactId、minInterval、maxInterval、date”，例如

1,120,123,'12/02/2010'  
1,145,147,'12/02/2010'  
2,122,124,'12/02/2010'  
2,320,322,'12/02/2010'  
2,450,451,'12/02/2010'

希望这是有道理的，基本上我正在寻找按提供者和日期计算间隔的最小/最大范围，以了解它们增加一的范围......一旦间隔增量器中断（例如不止一个）然后它会指示一个新的最小/最大范围......

非常感谢任何帮助:)

这是我的确切 SQL 表设置：

create table availability  
(  
 Id  (int)  
 ProviderId (int)  
 IntervalId (int)  
 Date (date)  
)

样本数据

providerid,intervalid,date  
1128,108,2010-12-27  
1128,109,2010-12-27  
1128,110,2010-12-27  
1128,111,2010-12-27  
1128,112,2010-12-27  
1128,113,2010-12-27  
1128,114,2010-12-27  
1128,120,2010-12-27  
1128,121,2010-12-27  
1128,122,2010-12-27  
1128,123,2010-12-27  
1128,124,2010-12-27  
1128,125,2010-12-27  
1213,108,2010-12-27  
1213,109,2010-12-27  
1213,110,2010-12-27  
1213,111,2010-12-27  
1213,112,2010-12-27  
1213,113,2010-12-27  
1213,114,2010-12-27  
1213,115,2010-12-27  
1213,232,2010-12-27  
1213,233,2010-12-27  
1213,234,2010-12-27  
3954,198,2010-12-27  
3954,199,2010-12-27  
3954,200,2010-12-27  
3954,201,2010-12-27   
3954,202,2010-12-27  
3954,203,2010-12-27   
3954,204,2010-12-27  
3954,205,2010-12-27  
3954,206,2010-12-27  
3954,207,2010-12-27  
3954,208,2010-12-27  
3954,209,2010-12-27  
3954,210,2010-12-27  
3954,211,2010-12-27  
3954,212,2010-12-27  
3954,213,2010-12-27  
3954,214,2010-12-27  
3954,215,2010-12-27  
3954,216,2010-12-27  
3954,217,2010-12-27  
3954,218,2010-12-27  
3954,229,2010-12-27  
3954,230,2010-12-27  
3954,231,2010-12-27  
3954,232,2010-12-27  
3954,233,2010-12-27  
3954,234,2010-12-27  
1128,108,2010-12-28  
1128,109,2010-12-28  
1128,110,2010-12-28  
1128,111,2010-12-28  
1128,112,2010-12-28  
1128,113,2010-12-28  
1128,114,2010-12-28  
1128,115,2010-12-28  
1128,116,2010-12-28  
3954,186,2010-12-28  
3954,187,2010-12-28  
3954,188,2010-12-28  
3954,189,2010-12-28  
3954,190,2010-12-28  
3954,213,2010-12-28  
3954,214,2010-12-28  
3954,215,2010-12-28  
3954,216,2010-12-28  
3954,217,2010-12-28  
3954,218,2010-12-28  
3954,219,2010-12-28  
3954,220,2010-12-28  
3954,221,2010-12-28  
3954,222,2010-12-28

在答案中使用当前 sql 的示例结果：

1062,180,180,2010-12-20  
1062,179,179,2010-12-20  
1062,178,178,2010-12-20  
1062,177,177,2010-12-20  
1062,176,176,2010-12-20  
1062,175,175,2010-12-20  
1062,174,174,2010-12-20  
1062,173,173,2010-12-20  
1062,172,172,2010-12-20  
1062,171,171,2010-12-20  
1062,170,170,2010-12-20  
1062,169,169,2010-12-20    
1062,168,168,2010-12-20  
1062,167,167,2010-12-20  
1062,166,166,2010-12-20  
1062,165,165,2010-12-20  
1062,164,164,2010-12-20  
1062,163,163,2010-12-20  
1062,162,162,2010-12-20  
1062,161,161,2010-12-20  
1062,160,160,2010-12-20  
1062,159,159,2010-12-20  
1062,158,158,2010-12-20  
1062,157,157,2010-12-20  
1062,156,156,2010-12-20  
1062,155,155,2010-12-20  
1062,154,154,2010-12-20  
1062,153,153,2010-12-20  
1062,152,152,2010-12-20  
1062,151,151,2010-12-20  
1062,150,150,2010-12-20  
1062,149,149,2010-12-20  
1062,148,148,2010-12-20  
1062,147,147,2010-12-20  
1062,146,146,2010-12-20  
1062,145,145,2010-12-20  
1062,144,144,2010-12-20  
1062,143,143,2010-12-20  
1062,142,142,2010-12-20  
1062,141,141,2010-12-20  
1062,140,140,2010-12-20  
1062,139,139,2010-12-20  
1062,138,138,2010-12-20  
1062,137,137,2010-12-20  
1062,136,136,2010-12-20  
1062,135,135,2010-12-20  
1062,134,134,2010-12-20  
1062,133,133,2010-12-20  
1062,132,132,2010-12-20  
1062,131,131,2010-12-20  
1062,130,130,2010-12-20  
1062,129,129,2010-12-20  
1062,128,128,2010-12-20  
1062,127,127,2010-12-20  
1062,126,126,2010-12-20  
1062,125,125,2010-12-20  
1062,124,124,2010-12-20  
1062,123,123,2010-12-20  
1062,122,122,2010-12-20  
1062,121,121,2010-12-20  
1062,120,120,2010-12-20  
1062,119,119,2010-12-20  
1062,118,118,2010-12-20  
1062,117,117,2010-12-20  
1062,116,116,2010-12-20  
1062,115,115,2010-12-20  
1062,114,114,2010-12-20  
1062,113,113,2010-12-20  
1062,112,112,2010-12-20

【问题讨论】：

您使用的是什么数据库？对于不同的后端，差距和孤岛解决方案可能会有所不同
“provider”指的是contactID字段是否正确？
我的错，是的，提供者是contactid - 我正在使用sql server。谢谢！

标签： sql sql-server

【解决方案1】：

在SQL Server、Oracle 和PostgreSQL：

WITH    q AS
        (
        SELECT  t.*, interval - ROW_NUMBER() OVER (PARTITION BY contactID, date ORDER BY interval) AS sr
        FROM    mytable t
        )
SELECT  contactID, date, MIN(interval), MAX(interval)
FROM    q
GROUP BY
        date, contactID, sr
ORDER BY
        date, contactID, sr

更新：

使用您的测试数据，我得到以下输出：

WITH    mytable (providerId, intervalId, date) AS
        (
        SELECT  1128,108,'2010-12-27' UNION ALL
        SELECT  1128,109,'2010-12-27' UNION ALL
        SELECT  1128,110,'2010-12-27' UNION ALL
        SELECT  1128,111,'2010-12-27' UNION ALL
        SELECT  1128,112,'2010-12-27' UNION ALL
        SELECT  1128,113,'2010-12-27' UNION ALL
        SELECT  1128,114,'2010-12-27' UNION ALL
        SELECT  1128,120,'2010-12-27' UNION ALL
        SELECT  1128,121,'2010-12-27' UNION ALL
        SELECT  1128,122,'2010-12-27' UNION ALL
        SELECT  1128,123,'2010-12-27' UNION ALL
        SELECT  1128,124,'2010-12-27' UNION ALL
        SELECT  1128,125,'2010-12-27'
        ),
        q AS
        (
        SELECT  t.*, intervalId - ROW_NUMBER() OVER (PARTITION BY providerId, date ORDER BY intervalId) AS sr
        FROM    mytable t
        )
SELECT  providerId, date, MIN(intervalId), MAX(intervalId)
FROM    q
GROUP BY
        date, providerId, sr
ORDER BY
        date, providerId, sr

1128  2010-12-27  108  114
1128  2010-12-27  120  125

，我。 e.正是你所追求的。

您确定您使用的查询正确吗？你在(providerId, intervalId, date) 上有重复吗？

【讨论】：

感谢您的回答 - 我不确定我是否关注这些列，例如small、sample 等。它们与我表中的列有什么关系？
@Andre：抱歉，您的帖子已被格式化，所以我认为 small、sample 和 data 是您的专栏标题 :)
我是这里的新手，还在学习如何正确格式化帖子 - 谢谢 :)
@Andre：顺便说一句，如果日期发生变化，是否会打破间隔系列？
要查询的表中将包含 4 周的数据，对于每一天，间隔只能在 1 到 288 之间 - 它代表一整天的时间，其中每个间隔为 5 分钟增量。这有意义吗？

【解决方案2】：

可能仅使用 SQL 查询就可以做到这一点，但这可能有点令人难以置信。基本上是一个子查询，用于查找它加一的位置，加入原始数据集，其中包含大量其他逻辑。至少这是我的印象。

如果我是你，

如果这是一次性交易，不要关心性能，只需对其进行迭代并“手动”进行计算。

如果这是一个生产数据集，并且您需要在频繁/自动化/性能密集型设置上执行此操作，则重新排列原始数据集以使此类查询更容易。

希望您可以使用这些选项之一。

【讨论】：