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ROWGUIDCOL indicates that the column is a row GUID column.

Only one uniqueidentifier column per table can be designated as the ROWGUIDCOL column, and the ROWGUIDCOL property can be assigned only to a uniqueidentifier column.

Note The data type of a column of a partitioned table cannot be changed.

The data type of columns included in an index cannot be changed unless the column is a varchar, nvarchar, or varbinary data type, and the new size is equal to or larger than the old size.

The modified column cannot be any one of the following: Some data type changes may cause a change in the data.

For example, changing an nchar or nvarchar column to char or varchar may cause the conversion of extended characters.

ROWGUIDCOL does not enforce uniqueness of the values that are stored in the column and does not automatically generate values for new rows that are inserted into the table.

If the new column allows null values and a default definition is added with the new column, WITH VALUES can be used to store the default value in the new column for each existing row in the table.

If the new column does not allow null values and the table is not empty, a DEFAULT definition must be added with the new column, and the new column automatically loads with the default value in the new columns in each existing row.

If not specified, the column is assigned the default collation of the database.

Collation name can be either a Windows collation name or a SQL collation name.