MS-Access SQL查询-按日期筛选

Question

I am trying to write up a Microsoft Access query that will return all of the data in a table where the assigned "Due By" date is within a day.

Meaning, when I come into the office in the AM, I should be able to run this query to see what was due yesterday and what is due today. Here is an example of the data:

 | ID | JobName                 | DueBy     |
 |----|-------------------------|-----------|
 | 1  | Sergio Pizza            | 5/5/2018  |
 | 2  | Hopkins Hospital        | 9/1/2018  |
 | 3  | Perry Hall High School  | 9/25/2018 |
 | 4  | Parkville High School   | 9/24/2018 |
 | 5  | Jim's House             | 9/24/2018 |

My current query is:

SELECT tblBid.*
FROM tblBid
WHERE (((tblBid.Due_By)>=(Now()-2)));

Which works in returning the correct dataset:

 | ID | JobName                 | DueBy     |
 |----|-------------------------|-----------|
 | 3  | Perry Hall High School  | 9/25/2018 |
 | 4  | Parkville High School   | 9/24/2018 |
 | 5  | Jim's House             | 9/24/2018 |

However, why do I need to write NOW()-2 and not NOW()-1? Why do I have to go back two days? When I write NOW()-1 I only get ID 3 for Perry Hall High School

Thank you!

Answer 1

您正在使用Now()函数，该函数返回当前日期和时间，表中的日期没有时间部分使其成为该日期的12AM，因此在Now() - 1 ，您需要使用Date()函数返回12AM的日期，然后可以将其用作Date() - 1

Answer 2

Use DateDiff :

SELECT tblBid.*
FROM tblBid
WHERE DateDiff("d", tblBid.Due_By, Date()) Between 1 and 0;