SQL Select Records based on current date minus two days

问题

I have an orders table which contains an order ID, order date and order description.

I want to run a select query which captures all orders that have been created in the last two days. so the current date minus two days. from the 14th December, I would want to select all orders where the order date is > 13th December. This needs to use a Get date function to pick up the current date and minus the days.

I have tried:

select * from orders where orderdate > getdate() - 2 

but this is not producing the correct results. Any idea's how to do this please?

回答1:

you should try to use dateadd function

select * from orders where orderdate > dateadd(dd,-1,cast(getdate() as date))

Now this may exactly what you need but then you need to understand that by casting to date we remove the time part and effectively going back to start of the day and a day behind it(-1) gives the start of yesterday.

回答2:

If you want the orders of the last two days, use DATEADD to add days to today's date (in your case -2 days) then use DATEDIFF to compare the two days:

SELECT * FROM orders
WHERE DATEDIFF(DAY, DATEADD(DAY, -2, GETDATE()), orderdate) > 0

Now, assuming all orders have dates in the past and none in the future (which is what it should be), you can simply use DATEDIFF like this:

SELECT * FROM orders
WHERE DATEDIFF(DAY, orderdate, GETDATE()) <= 2

Note: you can use < 3 instead of <= 2.

回答3:

Try this:

select * from orders where orderdate > cast(getdate() - 1 as date)

回答4:

Looks like dateadd and convert will solve the problem.

select   o.*
from     orders o
where    o.orderdate >= dateadd(day, -2, convert(date, getdate()))

来源：https://stackoverflow.com/questions/47818266/sql-select-records-based-on-current-date-minus-two-days