Wry neck, or torticollis, is a painfully twisted and tilted neck. The top of the head generally tilts to one side while the chin tilts to the other side. This condition can be congenital (present at birth) or acquired. It can also be the result of damage to the neck muscles or blood supply. Wry neck sometimes goes away without treatment.
In the quaternions, 0 is the additive identity. In the ring of functions from R to R, the function mapping every number to 0 is the additive identity. In the additive group of vectors in Rn, the origin or zero vector is the additive identity.
The OBJECTPROPERTY function can be used to determine whether a table has an IDENTITY column, and the COLUMNPROPERTY function can be used to determine the name of the IDENTITY column. SET IDENTITY_INSERT can be used to disable the IDENTITY property of a column by enabling values to be explicitly inserted. Note. If an identifier column exists for a table that has frequent deletions, gaps can occur between identity values. Deleted identity values are not reused.