创建一个只有工作日的表，不包括周末和公共假期

Question

我有 2 张桌子。

其中第一个包含每个月的工作日（年 = 2020）：

Month	Date from	Date to
January	01/01/2020	31/01/2020
February	01/02/2020	29/02/2020
March	01/03/2020	31/03/2020

其中第二个日期为 2020 年公共假期，格式如下：

Date	Week day	Code	Working hours
01/01/2020	Wednesday	Holiday	0
08/03/2020	Sunday	Holiday	0
01/09/2020	Tuesday	Holiday	0
24/12/2020	Thursday	Holiday	0

我想创建 1 个表（格式为 2nd 表），其中只有工作日的数据，不包括 2nd 表中的公共假期和 2020 年日历中的周末。

提前感谢您的帮助。

问候，

Answer 1

您可以使用以下方法创建表：

CREATE TABLE working_days (
  day           DATE PRIMARY KEY,
  week_day      VARCHAR2(9)
                GENERATED ALWAYS AS (CAST(RTRIM(TO_CHAR(day, 'FMDay')) AS VARCHAR2(9))),
  code          VARCHAR2(20),
  working_hours NUMBER(4,2)
);

然后使用插入数据：

INSERT INTO working_days (day, code, working_hours)
WITH days (dt, date_to) AS (
  SELECT TRUNC(date_from),
         date_to
  FROM   working_day_ranges
UNION ALL
  SELECT dt + INTERVAL '1' DAY,
         date_to
  FROM   days
  WHERE  dt + INTERVAL '1' DAY <= date_to
)
SELECT dt, 'Working Day', 23
FROM   days d
WHERE  NOT EXISTS (             -- Not a holiday
         SELECT 1
         FROM   holidays h
         WHERE  d.dt = h.dt
       )
AND    dt - TRUNC(dt, 'IW') < 5 -- Not a Saturday or Sunday;
ORDER BY dt;

（根据您的需要更改预期工作时间等。）

假设你的桌子：

CREATE TABLE working_day_ranges (Date_from, Date_to) AS
SELECT DATE '2020-01-01', DATE '2020-01-31' FROM DUAL UNION ALL
SELECT DATE '2020-02-01', DATE '2020-02-29' FROM DUAL UNION ALL
SELECT DATE '2020-03-01', DATE '2020-03-31' FROM DUAL;

ALTER TABLE working_day_ranges
  ADD month VARCHAR2(8)
               GENERATED ALWAYS AS (CAST(RTRIM(TO_CHAR(date_from, 'FMMonth')) AS VARCHAR2(8)));

CREATE TABLE holidays (dt, Code, Working_hours) AS
SELECT DATE '2020-01-01', 'Holiday', 0 FROM DUAL UNION ALL
SELECT DATE '2020-03-08', 'Holiday', 0 FROM DUAL UNION ALL
SELECT DATE '2020-09-01', 'Holiday', 0 FROM DUAL UNION ALL
SELECT DATE '2020-12-24', 'Holiday', 0 FROM DUAL;

ALTER TABLE holidays
  ADD week_day VARCHAR2(9)
               GENERATED ALWAYS AS (CAST(RTRIM(TO_CHAR(dt, 'FMDay')) AS VARCHAR2(9)));

然后：

SELECT * FROM working_days;

输出：

DAY	WEEK_DAY	CODE	WORKING_HOURS
02-JAN-20	Thursday	Working Day	23
03-JAN-20	Friday	Working Day	23
06-JAN-20	Monday	Working Day	23
07-JAN-20	Tuesday	Working Day	23
08-JAN-20	Wednesday	Working Day	23
09-JAN-20	Thursday	Working Day	23
10-JAN-20	Friday	Working Day	23
13-JAN-20	Monday	Working Day	23
14-JAN-20	Tuesday	Working Day	23
15-JAN-20	Wednesday	Working Day	23
16-JAN-20	Thursday	Working Day	23
17-JAN-20	Friday	Working Day	23
20-JAN-20	Monday	Working Day	23
21-JAN-20	Tuesday	Working Day	23
22-JAN-20	Wednesday	Working Day	23
23-JAN-20	Thursday	Working Day	23
24-JAN-20	Friday	Working Day	23
27-JAN-20	Monday	Working Day	23
28-JAN-20	Tuesday	Working Day	23
29-JAN-20	Wednesday	Working Day	23
30-JAN-20	Thursday	Working Day	23
31-JAN-20	Friday	Working Day	23
03-FEB-20	Monday	Working Day	23
04-FEB-20	Tuesday	Working Day	23
05-FEB-20	Wednesday	Working Day	23
06-FEB-20	Thursday	Working Day	23
07-FEB-20	Friday	Working Day	23
10-FEB-20	Monday	Working Day	23
11-FEB-20	Tuesday	Working Day	23
12-FEB-20	Wednesday	Working Day	23
13-FEB-20	Thursday	Working Day	23
14-FEB-20	Friday	Working Day	23
17-FEB-20	Monday	Working Day	23
18-FEB-20	Tuesday	Working Day	23
19-FEB-20	Wednesday	Working Day	23
20-FEB-20	Thursday	Working Day	23
21-FEB-20	Friday	Working Day	23
24-FEB-20	Monday	Working Day	23
25-FEB-20	Tuesday	Working Day	23
26-FEB-20	Wednesday	Working Day	23
27-FEB-20	Thursday	Working Day	23
28-FEB-20	Friday	Working Day	23
02-MAR-20	Monday	Working Day	23
03-MAR-20	Tuesday	Working Day	23
04-MAR-20	Wednesday	Working Day	23
05-MAR-20	Thursday	Working Day	23
06-MAR-20	Friday	Working Day	23
09-MAR-20	Monday	Working Day	23
10-MAR-20	Tuesday	Working Day	23
11-MAR-20	Wednesday	Working Day	23
12-MAR-20	Thursday	Working Day	23
13-MAR-20	Friday	Working Day	23
16-MAR-20	Monday	Working Day	23
17-MAR-20	Tuesday	Working Day	23
18-MAR-20	Wednesday	Working Day	23
19-MAR-20	Thursday	Working Day	23
20-MAR-20	Friday	Working Day	23
23-MAR-20	Monday	Working Day	23
24-MAR-20	Tuesday	Working Day	23
25-MAR-20	Wednesday	Working Day	23
26-MAR-20	Thursday	Working Day	23
27-MAR-20	Friday	Working Day	23
30-MAR-20	Monday	Working Day	23
31-MAR-20	Tuesday	Working Day	23

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