DATEDIFF() - Calculating DATETIME Value Differences in SQL Server
How To Calculate DATETIME Value Differences Using the DATEDIFF() Function in SQL Server Transact-SQL?
If you want to calculate the difference between two date and time values, you can use the DATEDIFF() function in the following format:
DATEDIFF(datepart, startdate, enddate) returns INT: "startdate" - the start date "enddate" - the end date "datepart" - one of predefined date part names See other tutorials for the list of names
Note that SQL Server manual says DATEDIFF() returns the number of boundaries crossed by the specified part between two specified dates. This can be interpreted as truncating all parts smaller than the specified part on both input date and time values, then calculating the difference. The following tutorial exercise shows you some good DATEDIFF() usage examples:
-- Difference in days - truncating all parts -- smaller than day DECLARE @birth_date DATETIME; DECLARE @today_date DATETIME; SET @birth_date = '2000-02-29 16:10:00.000'; SET @today_date = '2000-03-02 18:30:00.000'; SELECT DATEDIFF(day, @birth_date, @today_date); GO 2 -- Difference in hours - truncating all parts -- smaller than hour DECLARE @birth_date DATETIME; DECLARE @today_date DATETIME; SET @birth_date = '2000-02-29 16:10:00.000'; SET @today_date = '2000-03-02 18:30:00.000'; SELECT DATEDIFF(hour, @birth_date, @today_date); GO 50
â‡’Date/Time Operations and Functions in SQL Server Transact-SQL
2017-02-20, 2740👍, 0💬
How To Change the Name of a Database User in SQL Server? If you want to change the name of an existi...
What Is Oracle in Oracle? Oracle is a company. Oracle is also a database server, which manages data ...
How To Create a Dynamic Cursor with the DYNAMIC Option in SQL Server Transact-SQL? If the underlying...
How Fixed Length Strings Are Truncated and Padded in SQL Server Transact-SQL? When the length of the...
Where to find answers to frequently asked questions on INSERT, UPDATE and DELETE Statements in MySQL...