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weekday

weekday

Description

Syntax

INT WEEKDAY (DATETIME date)

WEEKDAY函数返回日期的工作日索引值,即星期一为0,星期二为1,星期日为6

参数为Date或者Datetime类型或者可以cast为Date或者Datetime类型的数字

注意WEEKDAY和DAYOFWEEK的区别:

          +-----+-----+-----+-----+-----+-----+-----+
| Sun | Mon | Tues| Wed | Thur| Fri | Sat |
+-----+-----+-----+-----+-----+-----+-----+
weekday | 6 | 0 | 1 | 2 | 3 | 4 | 5 |
+-----+-----+-----+-----+-----+-----+-----+
dayofweek | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+-----+-----+-----+-----+-----+-----+-----+

example

mysql> select weekday('2019-06-25');
+--------------------------------+
| weekday('2019-06-25 00:00:00') |
+--------------------------------+
| 1 |
+--------------------------------+

mysql> select weekday(cast(20190625 as date));
+---------------------------------+
| weekday(CAST(20190625 AS DATE)) |
+---------------------------------+
| 1 |
+---------------------------------+

keywords

WEEKDAY