sql server - SQL: Trigger is not performing -

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i have created trigger set value of column of data type time null when time inserted less getdate() 

alter trigger [dbo].[null_time_trigger]   on [dbo].[products]   after insert     update products   set parkingstarttime = null   products    join inserted      on i.parkingstarttime  = products.parkingstarttime    i.parkingstarttime < cast(getdate() time);

the problem when i select * table record still having time rather being null.

any ideas ?

regards.

rsenna has 1 option, , superior in many respects. here how play after insert version (asssume int pk):

alter trigger [dbo].[null_time_trigger]        on [dbo].[products]        after insert         declare @id int  select @id = id inserted  update products set parkingstarttime = null id = @id

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