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https://stackoverflow.com/questions/2896690/date-difference-in-sql-server-2005
Can someone please … in SQL Server 2005. sql-server-2005. Share. Improve this question. Follow edited May 24 '10 at 11:47. marc_s. 691k 163 163 gold badges 1282 1282 silver badges 1407 1407 bronze badges. ... <12 THEN 'less than a day' WHEN DATEDIFF(hour,StartDate,EndDate)<=24 THEN '1 day' ELSE null END AS DayOf FROM @YourTable ) dt ...
https://techcommunity.microsoft.com/t5/sql-server-support/using-datediff-can-cause-query-performance-problems-in-sql-2005/ba-p/315806
Using DateDiff can cause query performance problems in SQL 2005 and 2008. Jan 15 2019 12:19 PM. First published on MSDN on Jul 17, 2009. Lately, we have a customer who reported that a query used to run 20 minutes in 2000 now run serveral hours in SQL 2008. After examining the plan, we discovered that the estimates were much more off in SQL 2008.
https://www.w3schools.com/SQl/func_sqlserver_datediff.asp
Example. Return the difference between two date values, in hours: SELECT DATEDIFF (hour, '2017/08/25 07:00', '2017/08/25 12:45') AS DateDiff; Try it Yourself ». SQL Server Functions.
https://support.microsoft.com/en-us/topic/kb2481274-fix-a-query-that-uses-the-datediff-function-may-run-slowly-in-sql-server-2005-or-in-sql-server-2008-or-in-sql-server-2008-r2-ea387870-cec2-22ec-6e0f-83be4c1c48e4
Fixes slow performance that may occur when you run a query that contains a DATEDIFF function in SQL Server 2005 or in SQL Server 2008 or in SQL Server 2008 R2. This issue occurs because a suboptimal query plan is used while the query is running.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/cb240c83-d35a-4e54-be88-df431c9cf5af/replace-hour-in-datetime-field
It actually becomes easier in the sense that you don't need a CASE statement anymore. select dateadd(day,datediff(day,0,dateadd(hour,1,ProcessTime)),'23:00:00') from MyTable Essentially, it adds an hour to the ProcessTime column and then it uses the dateadd/datediff logic that Plamen outlined in his post to adjust that to 11pm for the day. So, for example, if the time is 10:59:59pm, then …
https://www.sqlteam.com/forums/topic.asp?TOPIC_ID=176582
for partial hours problem use: DateDiff(minute,CreatedDateTime, ResolvedDateTime) / 60.0 Can you take the code from the blog and use it as sql without the CREATE PROCEDURE part? or - calculating business hours is not just a simple few lines of code. Maybe you can request that a procedure or function be created on the server for you.
https://www.w3schools.com/SQL/trysqlserver.asp?filename=trysql_func_sqlserver_datediff3
SELECT DATEDIFF (hour, '2017/08/25 07:00', '2017/08/25 12:45') AS DateDiff; . Edit the SQL Statement, and click "Run SQL" to see the result.
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