For example, a computed column can have the definition: cost AS price * qty.
Using deterministic encryption allows searching using equality comparison, grouping, and joining tables using equality joins based on encrypted values, but can also allow unauthorized users to guess information about encrypted values by examining patterns in the encrypted column.
The expression cannot be a subquery or contain alias data types.Computed columns can be used in select lists, WHERE clauses, ORDER BY clauses, or any other locations in which regular expressions can be used, with the following exceptions: Based on the expressions that are used, the nullability of computed columns is determined automatically by the Database Engine.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).If the HISTORY_TABLE argument is not used, the system generates a new history table matching the schema of the current table in the same filegroup as the current table, creating a link between the two tables and enables the system to record the history of each record in the current table in the history table. Test2 AS n CREATE TABLE #t(x INT PRIMARY KEY); INSERT INTO #t VALUES (2); SELECT Test2Col = x FROM #t; GO CREATE PROCEDURE dbo.
If a temporary table is created with a named constraint and the temporary table is created within the scope of a user-defined transaction, only one user at a time can execute the statement that creates the temp table.If the PRIMARY KEY or UNIQUE constraint creates a clustered index, the data pages for the table are stored in the same filegroup as the index.If CLUSTERED is specified or the constraint otherwise creates a clustered index, and a Note In this context, default is not a keyword.--Disk-Based CREATE TABLE Syntax CREATE TABLE [ database_name . If the table is partitioned, the FILESTREAM_ON clause must be included and must specify a partition scheme of FILESTREAM filegroups that uses the same partition function and partition columns as the partition scheme for the table. ] 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 . The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators.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.