Validating columns

19-Aug-2016 05:16

] table_name ( [ PERIOD FOR SYSTEM_TIME ( system_start_time_column_name , system_end_time_column_name ) ] ) [ WITH ( can be a maximum of 128 characters, except for local temporary table names (names prefixed with a single number sign (#)) that cannot exceed 116 characters.Is an expression that defines the value of a computed column.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.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.Note After you create a partitioned table, consider setting the LOCK_ESCALATION option for the table to AUTO.

The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators.ON can also be specified in a PRIMARY KEY or UNIQUE constraint. If is specified, the index is stored in the named filegroup.If "default" is specified, or if ON is not specified at all, the index is stored in the same filegroup as the 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.

The expression can be a noncomputed column name, constant, function, variable, and any combination of these connected by one or more operators.ON can also be specified in a PRIMARY KEY or UNIQUE constraint. If is specified, the index is stored in the named filegroup.If "default" is specified, or if ON is not specified at all, the index is stored in the same filegroup as the 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.Note Varchar(max), nvarchar(max), varbinary(max), xml and large UDT values are stored directly in the data row, up to a limit of 8000 bytes and as long as the value can fit the record.