Get yesterdays date and if Monday get weekend range

问题

Is there a way to get yesterdays date. If the current date is monday I need three dates returned - Sunday, Saturday and Friday. Is there any way possible to accomplish this in a single query. I don't know VBA that well but if that is the only way to solve I am willing to get my hands dirty.

Select * from [Purchase Order] where MyDate = 'Yesterdays date(s)'

回答1:

The WeekDay() function will tell you whether today's date, as returned by the Date() function, is Monday. Use that in an IIf() expression so that MyDate matches yesterday's date when today is not Monday, or the previous 3 dates when MyDate is Monday.

SELECT *
FROM [Purchase Order] AS p
WHERE
    IIf(Weekday(Date()) = 2,
        p.MyDate BETWEEN DateAdd('d',-3,Date())
            AND DateAdd('d',-1,Date()),
        p.MyDate=DateAdd('d',-1,Date())
        );

来源：https://stackoverflow.com/questions/15907162/get-yesterdays-date-and-if-monday-get-weekend-range