Post about default constraints and potentially dangerous behavior of sp_bindefault stored procedure.
When you deal with old databases, with origins somewhere around second half of nineteen nineties, you can expect all kinds of oddities, like funny naming conventions, (lack of) referential integrity, absence of clustered indexes and things like rules and defaults created separately from tables DDL.
I just happen to work with such database. I see many tables which some time ago were migrated from a Sybase system that have their DEFAULT constraints defined with sp_bindefault stored procedure. You don’t have to memorize exact syntax of the invocation of this procedure because it is marked as obsolete and should not be used anymore.