如何设置field2 =工作日+1

Question

I'm looking for code that will automatically enter in the next weekday's date into Field2 when Field1 is not null. Or more precisely Field2 = Field1 + 1 weekday

I am using Access 2007 as a front End and SQL 2008 as a backend.

Any help would be greatly appreciated!

Answer 1

Sounds like you're looking for an UPDATE statement with DATEADD :

update YourTable 
set Field2 = dateadd(day,1,Field1)
where Field1 is not null

Or if you are trying to remove weekends and always update to the nearest Monday, then this is one way with CASE :

update YourTable 
set Field2 = 
  case 
    when datepart(dw,Field1) = 1 then dateadd(day,1,Field1)
    when datepart(dw,Field1) = 7 then dateadd(day,2,Field1)
    else dateadd(day,1,Field1)
  end
where Field1 is not null

• SQL Fiddle Demo

Answer 2

If you will be running a query from within Access against a linked SQL Server table, the query must use Access-compatible SQL.

To make Field2 one day later than the Field1 date:

UPDATE YourTable
SET Field2 = DateAdd('d', 1, Field1)
WHERE Field1 Is Not Null;

To skip over weekend days, use the Weekday function in a Switch statement to determine how many days to add.

UPDATE YourTable
SET Field2 =
    DateAdd
        (
            'd',
            Switch
                (
                    Weekday(Field1) = 6, 3,
                    Weekday(Field1) = 7, 2,
                    Weekday(Field1) >= 1 AND Weekday(Field1)<=5, 1
                ),
            Field1
        )
WHERE Field1 Is Not Null;