Question

我有如下表格

Id UserName PercentSharing ParentId
1  one      20             0
2  two      80             1
3  three    40             2
4  four     50             2
5  five     20             3
6  six      30             3

我要计算所有级别不超过100％

如果我将ID 2的PercentSharing更改为70，则其父级应更新为30，并且如果将用户ID 3或4的任何共享百分比设置为任何其他值，则它应将所有父级用户的共享百分比保持为100％。例如用户ID 3、2、1的总和不应超过100％

我要保持N值或水平的100％比率。

请建议我需要更改表结构吗？

Answer 1

请考虑以下内容；嵌套模型...

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(id CHAR(1) NOT NULL PRIMARY KEY
,pct INT NOT NULL
,lft INT NOT NULL
,rgt INT NOT NULL
);

INSERT INTO my_table VALUES
('A',20,1,12),
('B',80,2,11),
('C',40,3, 8),
('D',50,9,10),
('E',20,4, 5),
('F',30,6, 7); 

SELECT * FROM my_table x JOIN my_table y ON y.lft <= x.lft WHERE x.id = 'E';
+----+-----+-----+-----+----+-----+-----+-----+
| id | pct | lft | rgt | id | pct | lft | rgt |
+----+-----+-----+-----+----+-----+-----+-----+
| E  |  20 |   4 |   5 | A  |  20 |   1 |  12 |
| E  |  20 |   4 |   5 | B  |  80 |   2 |  11 |
| E  |  20 |   4 |   5 | C  |  40 |   3 |   8 |
| E  |  20 |   4 |   5 | E  |  20 |   4 |   5 |
+----+-----+-----+-----+----+-----+-----+-----+

SELECT x.*, SUM(y.pct) total FROM my_table x JOIN my_table y ON y.lft <= x.lft WHERE x.id = 'E' GROUP BY x.id;
+----+-----+-----+-----+-------+
| id | pct | lft | rgt | total |
+----+-----+-----+-----+-------+
| E  |  20 |   4 |   5 |   160 |
+----+-----+-----+-----+-------+
1 row in set (0.00 sec)

N个用户的共享百分比

1 个答案: