Query where date = '2016/01/02' not working? - sql-server

Question

SQL FIDDLE DEMO HERE
I have this structure of table:
CREATE TABLE Department
(
[IdDepartment] int,
[Name] varchar(23),
[IdUser] int,
[CreateDate] datetime
);
INSERT INTO Department ([IdDepartment], [Name], [IdUser], [CreateDate])
VALUES
(1, 'Sales', 3, '2016-01-15 17:00:00.000'),
(2, 'Finance', null, '2016-01-13 18:00:00.000' ),
(3, 'Accounting' , 5, '2016-03-21 22:00:00.000'),
(4, 'IT' ,3, '2016-03-21 17:00:00.000'),
(5, 'Secretary',null, '2016-03-21 17:00:00.000'),
(6, 'Sport',3, '2016-02-20 16:00:00.000');
I want to run this query:
select Name
from Department
where CreateDate = '2016-03-21'
This returns 0 rows as a result.
I think it is because the date in the table structure is a datetime but I try to do this and neither works for me:
select Name
from Department
where CreateDate like '%2016-03-21%'
The result should be this:
Name
-----
Accounting
IT
Secretary
How can I get this result?
I hope I explained clearly, thanks

Answer 1

You are comparing a DATETIME value against a pure DATE. You must be aware, that a DATETIME includes a time
2016-03-21 11:00:00 is NOT equal to 2016-03-21
You might compare like this
CAST(YourDate AS DATE)=CAST('2016-03-21' AS DATE)
Hint: As one tiny exception! - CAST(someCol AS DATE) actually is sargable, but it's worth to mention, that it still is not the best idea to do: dba.stackexchange.com/a/34052/70663
or you could try a BETWEEN
YourDate BETWEEN {d'2016-03-21'} AND {ts'2016-03-21 23:59:59'}
or - which is the most prefered in most cases
YourDate >= {d'2016-03-21'} AND YourDate < {d'2016-03-22'}
Avoid manipulations to the column value due to sargability
Better avoid date literals... If you have to, you might read this

Answer 2

Use CAST method to compare date only not time
SELECT * FROM Department
WHERE CAST(CreateDate AS DATE) ='2016-03-21'

Answer 3

Fully agree with #Shnugo
DECLARE #Department TABLE (
IdDepartment INT,
Name VARCHAR(23),
IdUser INT,
CreateDate DATETIME
);
INSERT INTO #Department
VALUES
(1, 'Sales', 3, '2016-01-15 17:00:00'),
(2, 'Finance', NULL, '2016-01-13 18:00:00'),
(3, 'Accounting', 5, '2016-03-21 22:00:00'),
(4, 'IT', 3, '2016-03-21 17:00:00'),
(5, 'Secretary', NULL, '2016-03-21 17:00:00'),
(6, 'Sport', 3, '2016-02-20 16:00:00')
DECLARE #Date DATETIME = '20160321' -- ISO format
SELECT Name
FROM #Department
WHERE CreateDate >= #Date
AND CreateDate < DATEADD(DAY, 1, #Date)