Updating an identity column sql server
The result of most expressions is considered nullable even if only nonnullable columns are present, because possible underflows or overflows also produce NULL results.
Use the COLUMNPROPERTY function with the Allows Null property to investigate the nullability of any computed column in a table.
For more information, see Indexes on Computed Columns.
Any computed columns that are used as partitioning columns of a partitioned table must be explicitly marked PERSISTED.
The expression cannot be a subquery or contain alias data types.
This can improve concurrency by enabling locks to escalate to partition (Ho BT) level instead of the table.
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It is an identifier for the default filegroup and must be delimited, as in ON "default" or ON [default].
If "default" is specified, the QUOTED_IDENTIFIER option must be ON for the current session. For more information, see SET QUOTED_IDENTIFIER (Transact-SQL).