一尘不染

有没有办法获得一个月的第一个和最后一个工作日?

sql

我想问一下是否有一种聪明或简单的方法来获取MySQL的每月的第一个和最后一个工作日。换句话说,我想避免使用“周末”,而是适当地调整第一天或最后一天的时间。

例如:

For the period: 2011-05-01 till 2011-05-31
First weekday should be: 2011-05-02 and not 2011-05-01 as 2011-05-01 is Sunday.
Last weekday should be: 2011-05-31 as it is Tuesday.

For the period: 2011-04-01 till 2011-04-30,
First weekday: 2011-04-01
Last weekday: 2011-04-29

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2021-05-23

共1个答案

一尘不染

如何定义功能FIRST_WDOM()(星期/一个月的工作日)并LAST_WDOM()采用样式LAST_DAY()

DELIMITER //
CREATE FUNCTION first_wdom (d DATETIME) -- First work/week day of month
RETURNS DATE DETERMINISTIC
BEGIN
  DECLARE first_dom DATE;
  SET first_dom = DATE_FORMAT(d, '%Y-%m-01');

  RETURN first_dom + INTERVAL (CASE DAYOFWEEK(first_dom)
                               WHEN 1 THEN 1
                               WHEN 7 THEN 2
                               ELSE 0
                               END) DAY;
END //
CREATE FUNCTION last_wdom (d DATETIME) -- Last work/week day of month
RETURNS DATE DETERMINISTIC
BEGIN
  DECLARE last_dom DATE;
  SET last_dom = LAST_DAY(d);

  RETURN last_dom - INTERVAL (CASE DAYOFWEEK(last_dom)
                              WHEN 1 THEN 2
                              WHEN 7 THEN 1
                              ELSE 0
                              END) DAY;
END //
DELIMITER ;

mysql> SELECT FIRST_WDOM('2011-05-10'), LAST_WDOM('2011-05-10');
+--------------------------+-------------------------+
| FIRST_WDOM('2011-05-10') | LAST_WDOM('2011-05-10') |
+--------------------------+-------------------------+
| 2011-05-02               | 2011-05-31              | 
+--------------------------+-------------------------+
1 row in set (0.01 sec)

这只是ic3b3rg答案的改编,并假定星期六和星期日为您的周末。我使用DATETIME而不是DATE作为输入类型,以避免传入时出现截断警告NOW()

2021-05-23