仅比较2个datetime列中的DATE-SQL

Question

How can I code to compare only the date (not time) from two different columns that is storing the date in 2015-01-10 01:20:00 format? Example.

Select * from Admissions
Where AdmitDateTime = DepartDateTime

Above will try to compare 2015-01-10 01:20:00 to 2015-01-10 01:20:00 instead of only date 2015-01-10 to 2015-01-10. Help Please. Thanks.

Answer 1

Select * from Admissions
Where CAST(AdmitDateTime as date) = CAST(DepartDateTime as date)

Answer 2

You can convert or cast a DATETIME data type to a DATE data type.

For example:

SELECT * 
FROM Admissions
WHERE 
CONVERT(DATE, AdmitDateTime) = CONVERT(DATE, DepartDateTime) 

Answer 3

Another way:

Select * from Admissions
Where DATEDIFF(dd,AdmitDateTime,DepartDateTime)=0