WEEKDAY()

函数说明

返回日期的工作日索引（0 = 星期一，1 = 星期二，… 6 = 星期日）。如果日期为 NULL，则返回 NULL。

函数语法

1. > WEEKDAY(date)

参数释义

示例

• 示例 1：

1. mysql> SELECT WEEKDAY('2008-02-03 22:23:00');
2. +------------------------------+
3. | weekday(2008-02-03 22:23:00) |
4. +------------------------------+
5. |                            6 |
6. +------------------------------+
7. 1 row in set (0.03 sec)

• 示例 2：

1. drop table if exists t1;
2. create table t1 (id int,d date, dt datetime,c char(10),vc varchar(20));
3. insert into t1 values (1,"2021-01-13", "2021-01-13 13:00:00", "2021-12-15", "2021-12-16");
4. insert into t1 values (1,"2021-01-31", "2021-01-31 13:00:00", "2021-12-15", "2021-12-16");
5. insert into t1 values (2,"2022-02-15", "2022-02-15 18:54:29", "2021-02-15", "2021-02-15");
6. insert into t1 values (2,"2022-02-28", "2022-02-28 18:54:29", "2021-02-15", "2021-02-15");
7. insert into t1 values (3,"2000-02-29", "2000-02-29 18:54:29", "2021-02-15", "2021-02-15");
8. insert into t1 values (4,"2023-03-17", "2021-02-17 23:54:59", "2021-03-17", "2021-03-17");
9. insert into t1 values (5,"1985-04-18", "1985-04-18 00:00:01", "1985-04-18", "1985-04-18");
10. insert into t1 values (6,"1987-05-20", "1987-05-20 22:59:59", "1987-05-20", "1987-05-20");
11. insert into t1 values (7,"1989-06-22", "1989-06-22 15:00:30", "1989-06-22", "1989-06-22");
12. insert into t1 values (8,"1993-07-25", "1987-07-25 03:04:59", "1993-07-25", "1993-07-25");
13. insert into t1 values (9,"1995-08-27", "1987-08-27 04:32:33", "1995-08-27", "1995-08-27");
14. insert into t1 values (10,"1999-09-30", "1999-09-30 10:11:12", "1999-09-30", "1999-09-30");
15. insert into t1 values (11,"2005-10-30", "2005-10-30 18:18:59", "2005-10-30", "2005-10-30");
16. insert into t1 values (12,"2008-11-30", "2008-11-30 22:59:59", "2008-11-30", "2008-11-30");
17. insert into t1 values (13,"2013-12-01", "2013-12-01 22:59:59", "2013-12-01", "2013-12-01");
18. insert into t1 values (14,null, null, null, null);

20. mysql> select weekday(d),weekday(dt) from t1;
21. +------------+-------------+
22. | weekday(d) | weekday(dt) |
23. +------------+-------------+
24. |          2 |           2 |
25. |          6 |           6 |
26. |          1 |           1 |
27. |          0 |           0 |
28. |          1 |           1 |
29. |          4 |           2 |
30. |          3 |           3 |
31. |          2 |           2 |
32. |          3 |           3 |
33. |          6 |           5 |
34. |          6 |           3 |
35. |          3 |           3 |
36. |          6 |           6 |
37. |          6 |           6 |
38. |          6 |           6 |
39. |       NULL |        NULL |
40. +------------+-------------+
41. 16 rows in set (0.01 sec)

43. mysql> select weekday(c),weekday(vc) from t1;
44. +------------+-------------+
45. | weekday(c) | weekday(vc) |
46. +------------+-------------+
47. |          2 |           3 |
48. |          2 |           3 |
49. |          0 |           0 |
50. |          0 |           0 |
51. |          0 |           0 |
52. |          2 |           2 |
53. |          3 |           3 |
54. |          2 |           2 |
55. |          3 |           3 |
56. |          6 |           6 |
57. |          6 |           6 |
58. |          3 |           3 |
59. |          6 |           6 |
60. |          6 |           6 |
61. |          6 |           6 |
62. |       NULL |        NULL |
63. +------------+-------------+
64. 16 rows in set (0.02 sec)