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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.
TEXTIMAGE_ON is not allowed if there are no large value columns in the table. If "default" is specified, or if TEXTIMAGE_ON is not specified at all, the large value columns are stored in the default filegroup.
The storage of any large value column data specified in CREATE TABLE cannot be subsequently altered.
An expression that is nullable can be turned into a nonnullable one by specifying ISNULL with the constant, where the constant is a nonnull value substituted for any NULL result.
REFERENCES permission on the type is required for computed columns based on common language runtime (CLR) user-defined type expressions.
Use large value types out of row option of sp_tableoption to store the entire LOB value out of the row. It is an identifier for the default filegroup and must be delimited, as in TEXTIMAGE_ON "default" or TEXTIMAGE_ON [default]. If the table contains FILESTREAM data and the table is partitioned, the FILESTREAM_ON clause must be included and must specify a partition scheme of FILESTREAM filegroups.
If "default" is specified, the QUOTED_IDENTIFIER option must be ON for the current session. For more information, see SET QUOTED_IDENTIFIER (Transact-SQL). This partition scheme must use the same partition function and partition columns as the partition scheme for the table; otherwise, an error is raised.
The storage mechanism of a table as specified in CREATE TABLE cannot be subsequently altered.
--Disk-Based CREATE TABLE Syntax CREATE TABLE [ database_name . For more information about File Tables, see File Tables (SQL Server).
] table_name [ AS File Table ] ( [ ,...n ] [ PERIOD FOR SYSTEM_TIME ( system_start_time_column_name , system_end_time_column_name ) ] ) [ ON ] [ TEXTIMAGE_ON ] [ FILESTREAM_ON ] [ WITH ( [ FILESTREAM ] [ COLLATE collation_name ] [ SPARSE ] [ MASKED WITH ( FUNCTION = ' mask_function ') ] [ CONSTRAINT constraint_name [ DEFAULT constant_expression ] ] [ IDENTITY [ ( seed,increment ) ] [ NOT FOR REPLICATION ] [ GENERATED ALWAYS AS ROW [ HIDDEN ] ] [ NULL | NOT NULL ] [ ROWGUIDCOL ] [ ENCRYPTED WITH ( COLUMN_ENCRYPTION_KEY = key_name , ENCRYPTION_TYPE = , ALGORITHM = ' AEAD_AES_256_CBC_HMAC_SHA_256' ) ] [ [ , ...n ] ) ] [ ON ] | [ FOREIGN KEY ] REFERENCES referenced_table_name [ ( ref_column ) ] [ ON DELETE ] [ ON UPDATE ] [ NOT FOR REPLICATION ] | CHECK [ NOT FOR REPLICATION ] ( logical_expression ) ] [ , ...n ] ) ] [ ON ] | FOREIGN KEY ( column [ ,...n ] ) REFERENCES referenced_table_name [ ( ref_column [ ,...n ] ) ] [ ON DELETE ] [ ON UPDATE ] [ NOT FOR REPLICATION ] | CHECK [ NOT FOR REPLICATION ] ( logical_expression ) --Memory optimized CREATE TABLE Syntax CREATE TABLE [database_name . AS File Table Applies to: SQL Server 2012 through SQL Server 2017. You do not specify columns because a File Table has a fixed schema.
PERSISTED Specifies that the SQL Server Database Engine will physically store the computed values in the table, and update the values when any other columns on which the computed column depends are updated.
Marking a computed column as PERSISTED lets you create an index on a computed column that is deterministic, but not precise.