在當前行滿足條件時為所有后續行設置值

Question

以下是基本員工表。 emp_id、manager_hierarchy、month_end_date 的組合對於表來說是唯一的。

CREATE TABLE employee_table_base
(
     emp_id        INTEGER NOT NULL,
     manager_hierarchy   INTEGER NOT NULL,
     month_end_date          TIMESTAMP NOT NULL,
     assisted_flag VARCHAR(1) NOT NULL
);

INSERT INTO employee_table_base(emp_id, manager_hierarchy, month_end_date, assisted_flag)
VALUES
(12345, 1, '2021-10-31', 'N' ),
(12345, 2, '2021-10-31', 'N' ),
(12345, 3, '2021-10-31', 'N' ),
(12345, 1, '2021-11-30', 'Y' ),
(12345, 2, '2021-11-30', 'Y' ),
(12345, 3, '2021-11-30', 'Y' ),
(12345, 1, '2021-12-31', 'Y' ),
(12345, 2, '2021-12-31', 'Y' ),
(12345, 3, '2021-12-31', 'Y' ),
(12345, 1, '2022-01-31', 'Y' ),
(12345, 2, '2022-01-31', 'Y' ),
(12345, 3, '2022-01-31', 'Y' ),
(12345, 1, '2022-02-02', 'Y' ),
(12345, 2, '2022-02-02', 'Y' ),
(12345, 1, '2022-03-31', 'Y' ),
(12345, 2, '2022-03-31', 'Y' ),
(12345, 1, '2022-04-30', 'Y' ),
(12345, 2, '2022-04-30', 'Y' ),
(12345, 1, '2022-05-31', 'Y' ),
(12345, 2, '2022-05-31', 'Y' ),
(12345, 3, '2022-05-31', 'Y' ),
(12345, 1, '2022-06-30', 'N' ),
(12345, 2, '2022-06-30', 'N' ),
(12345, 1, '2022-07-31', 'Y' ),
(12345, 2, '2022-07-31', 'Y' );

emp_id	manager_hierarchy	月末日期	輔助標志
12345	1	2021-10-31 00:00:00	ñ
12345	2	2021-10-31 00:00:00	ñ
12345	3	2021-10-31 00:00:00	ñ
12345	1	2021-11-30 00:00:00	是
12345	2	2021-11-30 00:00:00	是
12345	3	2021-11-30 00:00:00	是
12345	1	2021-12-31 00:00:00	是
12345	2	2021-12-31 00:00:00	是
12345	3	2021-12-31 00:00:00	是
12345	1	2022-01-31 00:00:00	是
12345	2	2022-01-31 00:00:00	是
12345	3	2022-01-31 00:00:00	是
12345	1	2022-02-02 00:00:00	是
12345	2	2022-02-02 00:00:00	是
12345	1	2022-03-31 00:00:00	是
12345	2	2022-03-31 00:00:00	是
12345	1	2022-04-30 00:00:00	是
12345	2	2022-04-30 00:00:00	是
12345	1	2022-05-31 00:00:00	是
12345	2	2022-05-31 00:00:00	是
12345	3	2022-05-31 00:00:00	是
12345	1	2022-06-30 00:00:00	ñ
12345	2	2022-06-30 00:00:00	ñ
12345	1	2022-07-31 00:00:00	是
12345	2	2022-07-31 00:00:00	是

所需的 output：

drop table if exists employee_table_ouput;
CREATE temp TABLE employee_table_ouput
(
     emp_id        INTEGER NOT NULL,
     manager_hierarchy   INTEGER NOT NULL,
     month_end_date          TIMESTAMP NOT NULL,
     assisted_flag VARCHAR(1) NOT NULL,
     assisted_baseline INTEGER NOT NULL
);


INSERT INTO employee_table_ouput(emp_id, manager_hierarchy, month_end_date, assisted_flag, assisted_baseline)
VALUES
(12345, 1, '2021-10-31', 'N', 0 ),
(12345, 2, '2021-10-31', 'N', 0 ),
(12345, 3, '2021-10-31', 'N', 0 ),
(12345, 1, '2021-11-30', 'Y', 0 ),
(12345, 2, '2021-11-30', 'Y', 0 ),
(12345, 3, '2021-11-30', 'Y', 0 ),
(12345, 1, '2021-12-31', 'Y', 1 ),
(12345, 2, '2021-12-31', 'Y', 1 ),
(12345, 3, '2021-12-31', 'Y', 1 ),
(12345, 1, '2022-01-31', 'Y', 1 ),
(12345, 2, '2022-01-31', 'Y', 1 ),
(12345, 3, '2022-01-31', 'Y', 1 ),
(12345, 1, '2022-02-02', 'Y', 1 ),
(12345, 2, '2022-02-02', 'Y', 1 ),
(12345, 1, '2022-03-31', 'Y', 1 ),
(12345, 2, '2022-03-31', 'Y', 1 ),
(12345, 1, '2022-04-30', 'Y', 1 ),
(12345, 2, '2022-04-30', 'Y', 1 ),
(12345, 1, '2022-05-31', 'Y', 1 ),
(12345, 2, '2022-05-31', 'Y', 1 ),
(12345, 3, '2022-05-31', 'Y', 1 ),
(12345, 1, '2022-06-30', 'N', 0 ),
(12345, 2, '2022-06-30', 'N', 0 ),
(12345, 1, '2022-07-31', 'Y', 1 ),
(12345, 2, '2022-07-31', 'Y', 1 );

emp_id	manager_hierarchy	月末日期	輔助標志	輔助基線
12345	1	2021-10-31 00:00:00	ñ	0
12345	2	2021-10-31 00:00:00	ñ	0
12345	3	2021-10-31 00:00:00	ñ	0
12345	1	2021-11-30 00:00:00	是	0
12345	2	2021-11-30 00:00:00	是	0
12345	3	2021-11-30 00:00:00	是	0
12345	1	2021-12-31 00:00:00	是	1
12345	2	2021-12-31 00:00:00	是	1
12345	3	2021-12-31 00:00:00	是	1
12345	1	2022-01-31 00:00:00	是	1
12345	2	2022-01-31 00:00:00	是	1
12345	3	2022-01-31 00:00:00	是	1
12345	1	2022-02-02 00:00:00	是	1
12345	2	2022-02-02 00:00:00	是	1
12345	1	2022-03-31 00:00:00	是	1
12345	2	2022-03-31 00:00:00	是	1
12345	1	2022-04-30 00:00:00	是	1
12345	2	2022-04-30 00:00:00	是	1
12345	1	2022-05-31 00:00:00	是	1
12345	2	2022-05-31 00:00:00	是	1
12345	3	2022-05-31 00:00:00	是	1
12345	1	2022-06-30 00:00:00	ñ	0
12345	2	2022-06-30 00:00:00	ñ	0
12345	1	2022-07-31 00:00:00	是	1
12345	2	2022-07-31 00:00:00	是	1

基線值總是在上一年的最后一天計算

case when month_end_date = date_trunc('year', current_date) - interval '1 day') and assisted_flag = 'Y' then 1 else 0 end as assisted_baseline

是否可以在 assisted_flag = 'Y' 時將當前年份的所有行設置為 1，並在 assisted_flag = 'N' 時設置為 0。 尋找可以在沒有自連接的情況下完成的解決方案。

Answer 1

將您的案例表達式修改如下：

select emp_id, manager_hierarchy, month_end_date, assisted_flag,
case 
  when (
         month_end_date = date_trunc('year', current_date) - interval '1 day'
         or
         date_trunc('year', current_date) = date_trunc('year', month_end_date)
        ) 
       and assisted_flag = 'Y' 
  then 1 else 0 
end as assisted_baseline
from employee_table_base

見演示。