How do I use case statement in SQL server 2008

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Hii,
This is my codition what i want
when @var='Pending' then field is null
when @var='Lotwise' then field=field
when @var='Canceled' then Canflag(another field)=1

Please give me solution for that.

What I have tried:

This what i did

Declare @status varchar(10);
set @status='Pending'
select EntryNo,entryDt,EntryLMBY,convert(date,EntryLMDT,106)EntryLMDT,LOtNo_Site2HO,Cancelflag  from dbo.tbl_Activity
where
CASE @status 
WHEN 'Pending' THEN LOtNo_Site2HO IS NULL
WHEN 'LotWise' THEN LOtNo_Site2HO=LOtNo_Site2HO
WHEN 'Canceld' THEN CANCELFLAG=1
end

Posted 3-Jan-18 18:15pm

SujataJK

Updated 3-Jan-18 18:55pm

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Karthik_Mahalingam · Accepted Answer · 2018-01-03T18:55:00

you shall try this

Declare @status varchar(10);
set @status='pending'

declare @query varchar(500)
declare @where varchar(100)
set @query  = 'select EntryNo,entryDt,EntryLMBY,convert(date,EntryLMDT,106)EntryLMDT,LOtNo_Site2HO,Cancelflag  from dbo.tbl_Activity where '
select  @where =    case @status
				    when 'pending' then ' LOtNo_Site2HO IS NULL '
					WHEN 'LotWise' THEN ' LOtNo_Site2HO=LOtNo_Site2HO '
					WHEN 'Canceld' THEN ' CANCELFLAG=1 '
					 else ' 1=1 ' 
					end 

set @query = @query + @where 
print @query
--exec(@query)