如何通过对 db2 或 sql 中的数据进行分组来生成一系列数字

Question

我有如下数据

Manager	City	Building	Floor	Number of Seats
xxx	BLR	SA2	2F	2
xyz	BLR	SA2	2F	3
xya	BLR	SA2	3F	2
xjk	BLR	SA2	3F	1

结果数据应该如下，按经理或建筑物和楼层分组，需要根据座位数生成一系列数字。

Manager	City	Building	Floor	Number of Seats
xxx	BLR	SA2	2F	1
xxx	BLR	SA2	2F	2
xyz	BLR	SA2	2F	3
xyz	BLR	SA2	2F	4
xyz	BLR	SA2	2F	5
xya	BLR	SA2	3F	1
xya	BLR	SA2	3F	2
xjk	BLR	SA2	3F	3

Answer 1

您可以通过 no_of_seats 销售产品，然后通过经理 ID 订购。

这里有一个方法可以做到这一点

 with row_gen(rn) as (
        select 1 from SYSIBM.SYSDUMMY1    
        union all
        select rn+ 1 from dummy where id < 10000 /*assumption that the number of seats isnt more than 10000*/
    )
    ,data
    as (
    select tb.mgr,tb.city,tb.bldg,tb.floor,rg.rn
      from row_gen rg
      join table tb
        on tb.no_of_seats<=rg.rn
        )
select d.mgr,d.city,d.bldg,d.floor
      ,row_number() over(partition by d.city,d.bldg,d.floor order by d.mgr) as no_of_seats
  from data d

Answer 2

with row_gen(rn) as (
              
  SELECT 1 AS rn FROM SYSIBM.SYSDUMMY1 
    UNION ALL
    SELECT rn+1  FROM row_gen WHERE rn+ 1 <=50
    ) 
    ,data
    as (
    select tb.manager,tb.location,tb.building,tb.floor,rg.rn
      from row_gen rg
      join db2inst1.tmp_cio_data tb
        on  rg.rn <= tb.seat_range_to
        )
select d.manager,d.location,d.building,d.floor,
     row_number() over(partition by d.location,d.building,d.floor order by d.manager) as no_of_seats
  from data d WHERE d.floor = 11 AND d.building = '12D' 

Answer 3

下面的解决方案不依赖于最大座位数。

WITH 
/*
  MYTAB (Manager, City, Building, Floor, Number_of_Seats) AS
(
VALUES
  ('xxx', 'BLR', 'SA2', '2F', 2)
, ('xyz', 'BLR', 'SA2', '2F', 3)
, ('xya', 'BLR', 'SA2', '3F', 2)
, ('xjk', 'BLR', 'SA2', '3F', 1)
)
, 
*/
  T (Manager, City, Building, Floor, Number_of_Seats) AS 
(  
SELECT Manager, City, Building, Floor, Number_of_Seats 
FROM MYTAB
    UNION ALL
SELECT Manager, City, Building, Floor, Number_of_Seats - 1
FROM T
WHERE Number_of_Seats > 1
)
SELECT 
  Manager, City, Building, Floor
, ROW_NUMBER () OVER (PARTITION BY City, Building, Floor ORDER BY Manager) AS Number_of_Seats
FROM T
ORDER BY City, Building, Floor, Manager

如果您取消注释推荐的 out 块和 运行 原样的语句，您将得到以下输出。

MANAGER	CITY	BUILDING	FLOOR	NUMBER_OF_SEATS
xxx	BLR	SA2	2F	1
xxx	BLR	SA2	2F	2
xyz	BLR	SA2	2F	3
xyz	BLR	SA2	2F	4
xyz	BLR	SA2	2F	5
xjk	BLR	SA2	3F	1
xya	BLR	SA2	3F	2
xya	BLR	SA2	3F	3