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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.
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.
REFERENCES permission on the type is required for computed columns based on common language runtime (CLR) user-defined type expressions.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.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.