How do I query for all dates greater than a certain date in SQL Server?

395
votes

I'm trying: 

SELECT * 
FROM dbo.March2010 A
WHERE A.Date >= 2010-04-01;

A.Date looks like: 2010-03-04 00:00:00.000

However, this is not working.

Can anyone provide a reference for why?

5
sqlsql-serverdatetime
put single quotes around it – Kevin DiTraglia
In addition to quotes, I recommend always using a safe and unambiguous format for date-only string literals. The only one I trust is YYYYMMDD. See my comment to David's answer for the reason why... – Aaron Bertrand

5 Answers

552
votes
select *  
from dbo.March2010 A 
where A.Date >= Convert(datetime, '2010-04-01' )

In your query, 2010-4-01 is treated as a mathematical expression, so in essence it read 

select *  
from dbo.March2010 A 
where A.Date >= 2005;

(2010 minus 4 minus 1 is 2005 Converting it to a proper datetime, and using single quotes will fix this issue.)

Technically, the parser might allow you to get away with

select *  
from dbo.March2010 A 
where A.Date >= '2010-04-01'

it will do the conversion for you, but in my opinion it is less readable than explicitly converting to a DateTime for the maintenance programmer that will come after you.

65
votes

Try enclosing your date into a character string.

 select * 
 from dbo.March2010 A
 where A.Date >= '2010-04-01';
19
votes

We can use like below as well

SELECT * 
FROM dbo.March2010 A
WHERE CAST(A.Date AS Date) >= '2017-03-22';

SELECT * 
    FROM dbo.March2010 A
    WHERE CAST(A.Date AS Datetime) >= '2017-03-22 06:49:53.840';
6
votes

To sum it all up, the correct answer is :

select * from db where Date >= '20100401'  (Format of date yyyymmdd)

This will avoid any problem with other language systems and will use the index.

3
votes
DateTime start1 = DateTime.Parse(txtDate.Text);

SELECT * 
FROM dbo.March2010 A
WHERE A.Date >= start1;

First convert TexBox into the Datetime then....use that variable into the Query