SQL：如何在忽略时间的情况下比较日期？

Question

How can I compare just the dates of timestamps while ignoring the times?

I just want to compare the month/date/year. For example:

select * from Batch
where openingtime <> closingtime

The problem is that this will show too many batches, since it will include batches where OpeningTime and ClosingTime differ only in the time of day:

---

OpeningTime = 2010-07-07 11:19:29.000

---

ClosingTime = 2010-07-07 19:19:22.000

Answer 1

cast both timestamps as dates

For SQL Server

Select * 
from Batch 
where cast(openingtime as date) <> cast(closingtime as date)

For Oracle

Select * 
from Batch 
where trunc(openingtime) <> trunc(closingtime)

Answer 2

Another way

Select * from Batch where      
CONVERT(VARCHAR(10),openingtime,110<>CONVERT(VARCHAR(10),closingtime,110)

Answer 3

Select * from Batch where      
CONVERT(VARCHAR(10),openingtime,110)<>CONVERT(VARCHAR(10),closingtime,110)

**There will be a closing bracket** @Miyamoto Musashi