T-SQL How to check if DataTime contains a Date string? - tsql

Question

I have a DateTime column row and I declare a date string:
Row:
2010-08-27 13:45:55
My string:
'2010-08-27'
How can I check if that string is in that row ?
I tried the following query:
declare #year as nvarchar(4)
declare #month as nvarchar(2)
declare #day as nvarchar(2)
set #year = '2010'
set #month = '08'
set #day = '23'
select * FROM [dbo].[customer_import] CsrImport
where
(YEAR(CsrImport.import_date) = #year
AND MONTH(CsrImport.import_date) = #month
AND DAY(CsrImport.import_date) = #day)
but I see that it returns all rows (even that are not contains that date)

Answer 1

Sql server : ISDATE (Transact-SQL)
----Invalid date
SELECT ISDATE('30/2/2007')
RETURNS : 0 (Zero)
----Valid date
SELECT ISDATE('12/12/20007)'
RETURNS : 1 (ONE)
----Invalid DataType
SELECT ISDATE('SQL')
RETURNS : 0 (Zero)

Answer 2

Like this, this will also be able to use the index, do not use function on the column itself..it is not SARGable!!
where import_date >= convert(datetime,#year + #month + #day)
and import_date < convert(datetime,#year + #month + #day) + 1
The best way for you would be to use dates and not 3 different parameters, what if someone passes in 13 for month?
Here is an example which checks that the values that are passed in can be converted to a date, if not it will show an error message
DECLARE #year AS NVARCHAR(4)
DECLARE #month AS NVARCHAR(2)
DECLARE #day AS NVARCHAR(2)
SET #year = '2010'
SET #month = '08'
SET #day = '23'
DECLARE #date DATETIME
IF ISDATE(#year + #month + #day) = 0
BEGIN
RAISERROR('values passed in are not a valid date',16,1)
RETURN
END
ELSE
BEGIN
SET #date = #year + #month + #day
END
SELECT * FROM [dbo].[customer_import] CsrImport
WHERE import_date >=#date
AND import_date < #date + 1

Answer 3

That should work, howabout if you make the values INTS
declare #year as INT
declare #month as INT
declare #day as INT
set #year = 2010
set #month = 08
set #day = 23
select * FROM [dbo].[customer_import] CsrImport
where
(YEAR(CsrImport.import_date) = #year
AND MONTH(CsrImport.import_date) = #month
AND DAY(CsrImport.import_date) = #day)
EDIT: Make sure all the statement is highlighted when you run it too. As simple as it seems, is it possible you mised the where clause if you highlighted the statement.

Answer 4

Just turn the datestring into a date (or datetime) variable and use a where clause:
Since your table has times in it, you have to strip them out or compare them to the midnioght before and after
Declare #myDate DateTime
Set #myDate = 'August 23 2010'
Select * FROM [dbo].[customer_import] CsrImport
Where DateDiff(day, myDate,import_date) = 0 -- Not Sargable
or
Declare #myDate DateTime
Set #myDate = 'August 23 2010'
Select * FROM [dbo].[customer_import] CsrImport
Where import_date) Between #mydate And #Mydate + 1 -- Sargable