Replacing a NULL in a view

I have created a view over a table that extracts production
information. The undelying table contains rows not just for product
code changed but also for speed changes.
The folloing view fillers out the speed changes and seems to work bar
one small problem. The EndTime for the currently running product will
be NULL as it is still running. This is a proble as I miss the current
production information. Is there a way to make the EndTime NULL in the
MAX function if the table value is NULL or could NULL be replaced with
the current Datetime
SELECT TOP 100 PERCENT *, DATEDIFF(hh, StartTime, EndTime) AS
HoursRun
FROM (SELECT Unit, Line, ProductCode, MIN(StartTime) AS
StartTime, MAX(EndTime) AS EndTime
FROM D_ProductionLog
GROUP BY Unit, Line, ProductCode) ProdLog
ORDER BY StartTime, Unit, Line, ProductCode
Many thanks
JimYou can use ISNULL to provide a different value for one that is NULL.
for example
SELECT TOP 100 PERCENT *, DATEDIFF(hh, StartTime, EndTime) AS
HoursRun
FROM (SELECT Unit, Line, ProductCode, MIN(StartTime) AS
StartTime, ISNULL(MAX(EndTime), GETDATE()) AS EndTime
FROM D_ProductionLog
GROUP BY Unit, Line, ProductCode) ProdLog
ORDER BY StartTime, Unit, Line, ProductCode
--
Jacco Schalkwijk MCDBA, MCSD, MCSE
Database Administrator
Eurostop Ltd.
"Jim" <jim.holmes@.devro-casings.com> wrote in message
news:68dfae14.0307230512.64cddbc6@.posting.google.com...
> I have created a view over a table that extracts production
> information. The undelying table contains rows not just for product
> code changed but also for speed changes.
> The folloing view fillers out the speed changes and seems to work bar
> one small problem. The EndTime for the currently running product will
> be NULL as it is still running. This is a proble as I miss the current
> production information. Is there a way to make the EndTime NULL in the
> MAX function if the table value is NULL or could NULL be replaced with
> the current Datetime
> SELECT TOP 100 PERCENT *, DATEDIFF(hh, StartTime, EndTime) AS
> HoursRun
> FROM (SELECT Unit, Line, ProductCode, MIN(StartTime) AS
> StartTime, MAX(EndTime) AS EndTime
> FROM D_ProductionLog
> GROUP BY Unit, Line, ProductCode) ProdLog
> ORDER BY StartTime, Unit, Line, ProductCode
> Many thanks
> Jim