如何在SQL Server中为行分区设置分区ID /名称？

Question

如何在SQL Server中为行分区设置分区ID /名称？

name surname val
a  b      10
c  d      2
a  b      11
a  b      13

结果（按名称和姓氏划分）：

 name surname val rowno partitionid

 a    b        10   1    1
 a    b        11   2    1
 a    b        13   3    1
 c    d        2    1    2

Answer 1

DECLARE @table TABLE( name CHAR(1) , surname CHAR(1) , val TINYINT )

INSERT INTO @table
VALUES ( 'a' , 'b' , 10 ) 
, ( 'c' , 'd' , 2 )
, ('a' , 'b' , 11 )
, ( 'a' , 'b' , 13 )

SELECT * FROM @table

SELECT *
, ROW_NUMBER() OVER ( PARTITION BY name, surname ORDER BY val ) as rowno
, DENSE_RANK() OVER ( ORDER BY name ) as partitionid
FROM @table

问候！

Answer 2

dense_rank窗口函数似乎符合要求：

SELECT *,
       DENSE_RANK() OVER (PARTITION BY name, surname ORDER BY val) AS rowno,
       DENSE_RANK() OVER (ORDER BY name, surname) AS partitionid
FROM   mytable