The GUID value for the column must be supplied either by an application when data is being inserted, or by a DEFAULT constraint that uses the NEWID () function. This column must not allow null values and must have either a UNIQUE or PRIMARY KEY single-column constraint. When FILESTREAM is specified for a column, the table must also have a column of the uniqueidentifier data type that has the ROWGUIDCOL attribute. Optionally specifies the FILESTREAM storage attribute for column that has a type_name of varbinary(max). Before typing an xml column to a schema, the schema must first be created in the database by using CREATE XML SCHEMA COLLECTION. DOCUMENT applies only to the xml data type and can be specified only if xml_schema_collection is also specified.Īpplies only to the xml data type for associating an XML schema collection with the type. Specifies that each instance of the xml data type in column_name can comprise only one top-level element. If this is not specified, CONTENT is the default behavior. CONTENT applies only to the xml data type and can be specified only if xml_schema_collection is also specified. Specifies that each instance of the xml data type in column_name can comprise multiple top-level elements. These are used for storing 2^31 bytes of character and binary data, and 2^30 bytes of Unicode data. For more information about valid scale values, see Precision, Scale, and Length (Transact-SQL).Īpplies only to the varchar, nvarchar, and varbinary data types. Is the scale for the specified data type. For more information about valid precision values, see Precision, Scale, and Length (Transact-SQL). Is the precision for the specified data type.
The default schema of the current user in the current database. If type_schema_name is not specified, the Microsoft Database Engine references type_name in the following order: NET Framework user-defined type must be created by using CREATE TYPE before it can be used in a table definition. NET Framework user-defined type and the schema to which it belongs. Alias data types must be created by using CREATE TYPE before they can be used in a table definition.Ī Microsoft. Is the data type for the column that is added and the schema to which it belongs.Īn alias data type based on a SQL Server system data type. If no column_name is specified for a timestamp data type column, the name timestamp is used. For new columns, created with a timestamp data type, column_name can be omitted. column_name can consist of 1 through 128 characters. Is the name of the column to be altered, added, or dropped. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation. Transact-SQL Syntax Conventions Syntax column_name Specifies the properties of a column that are added to a table by using ALTER TABLE. Part of a network of sites that includes GlobalFirepower, a data-driven property used in ranking the top military powers of the world, (World Directory of Modern Military Aircraft), (World Directory of Modern Military Warships), and, detailing the history of the world's most iconic spyplane.Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance
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