Can a Check constraint relate to another table?

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In response to your comment on GSerg’s answer, here’s an example check constraint using a function:

alter table YourTable
add constraint chk_CheckFunction
check (dbo.CheckFunction() = 1)

Where you can define the function like:

create function dbo.CheckFunction()
returns int
as begin
    return (select 1)
end

The function is allowed to reference other tables.

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