WEEKDAY

weekday

デスクリプション

Syntax

INT WEEKDAY (DATETIME date)

WEEKDAY関数は、日付の曜日のインデックス値を返します。つまり、月曜日は0、火曜日は1、日曜日は6となります。

パラメータはDateまたはDatetime型です

WEEKDAYとDAYOFWEEKの違いに注意してください：

          +-----+-----+-----+-----+-----+-----+-----+
          | 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