Incorrect syntax near '<'

问题

I have a task to get some code which is working correctly on SQL Server 2012 to work on SQL Server 2008 R2 as well. I got this error:

Additional information: Incorrect syntax near '<'

When I try to run my code I found out that something is wrong in this line of my SQL code

ALTER TABLE [dbo].[WorkTimeEntries] 
  ADD [TimeFinishedForRuntime] AS ISNULL([TimeFinished],
        IIF ([TimeStarted] < SYSUTCDATETIME(), [dbo].[udf_GetCurrentDateTimeOffsetInTimeZone](DATENAME(TZOFFSET, [TimeStarted])), [TimeStarted]));

I have read that in this cases took place some kind of error when people try to get date, but I'm not sure what's wrong in my case.

回答1:

There was no IIF in SQL Server 2008R2.

Replace it with CASE

ALTER TABLE [dbo].[WorkTimeEntries] ADD [TimeFinishedForRuntime] AS ISNULL(
    [TimeFinished],
    CASE WHEN [TimeStarted] < SYSUTCDATETIME() THEN [dbo].[udf_GetCurrentDateTimeOffsetInTimeZone](DATENAME(TZOFFSET, [TimeStarted])) ELSE [TimeStarted] END);

来源：https://stackoverflow.com/questions/39300057/incorrect-syntax-near