DAYOFWEEK(date)
返回 date 的星期索引(1 = Sunday, 2 = Monday, ... 7 = Saturday)。
WEEKDAY(date)
返回 date 的星期索引(0 = Monday, 1 = Tuesday, ... 6 = Sunday):
返回 date 的星期索引(1 = Sunday, 2 = Monday, ... 7 = Saturday)。
WEEKDAY(date)
返回 date 的星期索引(0 = Monday, 1 = Tuesday, ... 6 = Sunday):
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