What to do when I want to use database constraints but only mark as deleted instead of deleting?

Question

I am working in a project where database items are not deleted, but only marked as deleted. Something like this:

id   name     deleted
---  -------  --------         


        

Answer 1

For a simple table called [Test] with columns ID(int), Filter(nvarchar), Deleted(bit)

ALTER TABLE [dbo].[Test] ADD 
    CONSTRAINT [DF_Test_Deleted] DEFAULT (0) FOR [Deleted],
    CONSTRAINT [IX_Test] UNIQUE  NONCLUSTERED 
    (
        [filter],
        [Deleted]
    )  ON [PRIMARY]