Sql server T-SQL向分组数据添加计数器
我试图生成一个查询,该查询显示一列,该列为每组数据集递增(计数)。结果的总体顺序无关紧要,但事件必须按日期(最早=1)计数,并应为每组分组数据重置。下面是一个示例表ProductInteractionsSql server T-SQL向分组数据添加计数器,sql-server,tsql,Sql Server,Tsql,我试图生成一个查询,该查询显示一列,该列为每组数据集递增(计数)。结果的总体顺序无关紧要,但事件必须按日期(最早=1)计数,并应为每组分组数据重置。下面是一个示例表ProductInteractions +---------+------------+----------------+------------+ | User ID | Product ID | Date Purchased | Occurrence | +---------+------------+--------------
+---------+------------+----------------+------------+
| User ID | Product ID | Date Purchased | Occurrence |
+---------+------------+----------------+------------+
| user15 | b1290 | 1/1/2012 | 1 |
| user15 | b1290 | 1/15/2013 | 2 |
| user15 | b1290 | 3/15/2019 | 3 |
| user15 | a7983 | 7/22/2017 | 1 |
| user2 | a7983 | 12/3/2015 | 1 |
| user2 | a7983 | 5/6/2016 | 2 |
| user3 | a7983 | 3/24/2017 | 1 |
+---------+------------+----------------+------------+
原始数据:
+---------+------------+-----------+
| User ID | Product ID | Date |
+---------+------------+-----------+
| user15 | b1290 | 1/1/2012 |
| user2 | a7983 | 5/6/2016 |
| user15 | b1290 | 3/15/2019 |
| user15 | a7983 | 7/22/2017 |
| user2 | a7983 | 12/3/2015 |
| user15 | b1290 | 1/15/2013 |
| user3 | a7983 | 3/24/2017 |
+---------+------------+-----------+
注意,在上面的示例中,user15和产品b1290有3个交互。重要的是,第一次发生与初始交互日期相关,后续交互按递增日期计数
我相信查询的基本格式是:
SELECT [User ID],
[Product ID],
[Date Purchased]
-- Something here utilizing IDENTITY, maybe?
FROM ProductInteractions
GROUP BY [User ID],
[Product ID];
对于这一点,一个简单的方法是完美的
SELECT [User ID],
[Product ID],
[Date Purchased]
, ROW_NUMBER() over(partition by [User ID], [Product ID] order by [Date Purchased])
FROM ProductInteractions
GROUP BY [User ID],
[Product ID];
使用行编号()
下面是测试/验证以下脚本的代码:用自己的表替换ProductInteractions
declare @ProductInteractions as table([User ID] varchar(50),[Product ID] varchar(50),[Date] datetime)
insert into @ProductInteractions values
('user15' , 'b1290' , '1/1/2012' ),
('user2' , 'a7983' , '5/6/2016' ),
('user15' , 'b1290' , '3/15/2019' ),
('user15' , 'a7983' , '7/22/2017' ),
('user2' , 'a7983' , '12/3/2015' ),
('user15' , 'b1290' , '1/15/2013' ),
('user3' , 'a7983' , '3/24/2017' )
select [User ID],[Product ID],[Date],
row_number() over(partition by [User ID],[Product ID] order by [date]) [occurence]
from @ProductInteractions order by [Product ID] desc
你知道行号()吗?我不知道,但我现在知道了。谢谢谢谢你的帮助!我得练习一下这个。这对我的日常生活绝对有帮助。这太棒了!谢谢我真的很欣赏截图。