Convert NULL to NOT NULL col on massive SQL Server table -


i got table hundreds of millions of rows. 1 column, lets call ref_id, defined as: 

ref_id uniqueidentifier null references ref(id)

is there way make column not null , drop fk constraint?

i have managed delete entries null ref_id when do

alter table tbl alter column ref_id uniqueidentifier not null

then nothing happens after 8 hours (waiting while executing)\

thanks


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