Trunc(sysdate) in SQL Server

Question

What is the equivalent of:

TRUNC(SYSDATE) 

...in SQL Server 2005?

Answer 1

Recommended:

DATEADD(dd, 0, DATEDIFF(dd, 0, GETDATE()))

This is another alternative, but it's risky because of casting to a FLOAT. It's also been demonstrated to not scale performance as well as the DATEADD/DATEDIFF approach.

CAST(FLOOR(CAST(GETDATE() AS FLOAT)) AS DATETIME)

Answer 2

Another option is to use CONVERT (MSSQL 2008 and later) and either use an appropriate style or use a style that you can then SUBSTRING. I have no idea about the performance compared to the dateadd/datediff solution though.

eg

SELECT SUBSTRING(CONVERT(nvarchar(30), GETDATE(), 120), 1, 16)

Returns:

2012-01-03 15:30

Example using group that lists rows created per minute (presupposes a 'created' datetime column):

SELECT SUBSTRING(CONVERT(nvarchar(30), created, 120), 1, 16) as [minute]
, COUNT(1) as [per min]
FROM foo
GROUP BY SUBSTRING(CONVERT(nvarchar(30), created, 120), 1, 16)

Answer 3

As of SQL Server 2022 CTP 2.1, DATETRUNC() is now supported which should line up well with the TRUNC() capability in Oracle. Documentation can be found here .