How to get all records if parameter is null

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SQL-Server-2005

Hi friends,
I have 2 tables
1. RPT_MRFProgressDetails
2. MasterData

RPT_MRFProgressDetails has column MPD_DemandStatus which has values as well as null value

I tried following:

Declare @RRPTDemandStatus char(7) = null
select mpd.MPD_DemandStatus, m.Description,* from RPT_MRFProgressDetails mpd
left outer join MasterData M on mpd.MPD_DemandStatus = M.Id
where mpd.MPD_DemandStatus = ISNULL(@RRPTDemandStatus, mpd.MPD_DemandStatus)

Above query gives me records which has value in MPD_DemandStatus column, Null values are ignored.

I want all records from RPT_MRFProgressDetails including MPD_DemandStatus column having null values.

Any idea how to do??

Thanks in avdance

Posted 9-May-13 0:10am

dhage.prashant01

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gvprabu · Accepted Answer · 2013-05-09T00:13:00

Solution 1

Hi,
Check the following Query... use OR Operator for this simple checking.

SQL

Declare @RRPTDemandStatus char(7) = null
select mpd.MPD_DemandStatus, m.Description,* from RPT_MRFProgressDetails mpd
left outer join MasterData M on mpd.MPD_DemandStatus = M.Id
where ((mpd.MPD_DemandStatus = @RRPTDemandStatus AND @RRPTDemandStatus IS NOT NULL) OR @RRPTDemandStatus IS NULL)

Regards,
GVPrabu

Posted 9-May-13 0:13am

gvprabu

Updated 9-May-13 0:41am

v2

Comments

dhage.prashant01 9-May-13 6:35am

This works fine, but when i put and MPD.MPD_MRFStatusID = 5 (open state) in where clause
it gives me all records including null but MPD_MRFStatusID = 5 does not work

gvprabu 9-May-13 6:42am

Check now I updated my solution

dhage.prashant01 9-May-13 6:45am

(MPD.MPD_DemandStatus = @RRPTDemandStatus OR @RRPTDemandStatus is null) worked for me

btw what does below condition mean?
@RRPTDemandStatus is null

gvprabu 9-May-13 6:48am

See When ever @RRPTDemandStatus variable contains any value then only it will check the table values else it will return all records from ur table.

gvprabu 9-May-13 6:50am

See if u pass any values for @RRPTDemandStatus variable then u need only those details else u want to list all records right(Else case U will pass NULL for @RRPTDemandStatus variable) right. then this is correct, check and confirm or tel me whts your actual requirement.

dhage.prashant01 9-May-13 6:55am

as per my knowledge following works fine
ISNULL(@RRPTDemandStatus, mpd.MPD_DemandStatus)

In my case i had records which null values for the MPD_DemandStatus column, so in my condition records with null value was missing.

But when i added following
(MPD.MPD_DemandStatus = @RRPTDemandStatus OR @RRPTDemandStatus is null)
it worked perfectly

@RRPTDemandStatus is null
Fetched all records with null value

But my concern is what below condition does?
@RRPTDemandStatus is null

gvprabu 9-May-13 6:59am

if working then fine. @RRPTDemandStatus is null condition is extra in case u need to list only @RRPTDemandStatus status records or all the records from table then u need to add this, else leave it.

dhage.prashant01 9-May-13 7:02am

Thanks :)