Question

我正在尝试派生一个分页逻辑。

我有以下字段：

RecordNo  Lines 

1          20
2          130
3          50
4          60
5          350
6          100

说我的页面大小是170行。

我想得到的结果是：

RecordNo Lines CumSum PageNo

1         20   20      1
2         130  150     1
3         50   50      2   (as cumulative sum 200 exceeds 170, reset to 0)
4         60   110     2
5         350  350     3   ((as cumulative sum 460 exceeds 170, reset to 0)
6         100  100     4   ((as cumulative sum 460 exceeds 170, reset to 0)

我可以使用游标来实现，但有没有办法只通过SQL实现它？

以下是OP发布的ddl和示例数据：

CREATE TABLE PAGING (RECORDNO INT, LINES INT ); 
INSERT INTO PAGING VALUES(1,20); 
INSERT INTO PAGING VALUES(2,130); 
INSERT INTO PAGING VALUES(3,50); 
INSERT INTO PAGING VALUES(4,60); 
INSERT INTO PAGING VALUES(5,350); 
INSERT INTO PAGING VALUES(6,100);

更新

Zohar，感谢您对此进行调查。该查询与我提供的数据完美配合，但是当我扩展了更多数据时，由于页面基数不会超过170而移动，因此无法提供正确的结果。

以下是我尝试使用SQL的数据：

INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (1, 20);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (2, 130);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (3, 50);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (4, 60);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (5, 350);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (6, 100);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (7, 20);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (8, 10);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (9, 20);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (10, 30);   
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (11, 5);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (12, 5);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (13, 5);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (14, 10);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (15, 205);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (16, 156);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (17, 5);    
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (18, 2);   
INSERT [dbo].[PAGING] ([RECORDNO], [LINES]) VALUES (19, 7);

Answer 1

<强>更新
以下是完整的解决方案and it's fiddle link：

WITH cte AS
(
    SELECT RECORDNO, 
           LINES, 
           SUM(LINES) OVER (ORDER BY RECORDNO) CumSum,
           SUM(LINES) OVER (ORDER BY RECORDNO) / 170 AS PageNumberBase
    FROM PAGING
)

SELECT RECORDNO, 
       LINES, 
       SUM(LINES) OVER (PARTITION BY PageNumberBase ORDER BY RECORDNO) As CumSum,
       DENSE_RANK() OVER(ORDER BY PageNumberBase) As PageNumber
FROM cte
ORDER BY RECORDNO

第一个版本：

使用dense_rank窗口功能和cte我能够产生非常接近的东西，只是cumSum并不完美。
不幸的是，我没有时间玩它更多，所以我将它留在这里，带有sqlFiddle的链接，希望OP或其他人能够完成解决方案：

WITH cte AS
(
    SELECT RECORDNO, 
           LINES, 
           SUM(LINES) OVER (ORDER BY RECORDNO) CumSum,
           SUM(LINES) OVER (ORDER BY RECORDNO) / 170 AS PageNumber
    FROM PAGING
)

SELECT RECORDNO, 
       LINES, 
       PageNumber,
       CumSum - (170 * PageNumber) As CumSum,
       DENSE_RANK() OVER(ORDER BY PageNumber)
FROM cte

Here is the link to the fiddle

SQL Server - 重置正在运行的总计

1 个答案: