sql - What GUID can I use as a placeholder -
i have database table has non null column of type uniqueidentifier
. put in place use in near future. now, need use placeholder. can use:
00000000-0000-0000-0000-000000000000
for rows until real guid used when new rows inserted in future? sql server enforce uniqueness on column?
sql server enforce uniqueness, if , if you put unique constraint or unique index on field. otherwise, sql server enforce value must not null.
Comments
Post a Comment