Start Updating multiple columns in sql

Updating multiple columns in sql

To change the collation of a user-defined alias data type column, you must execute separate ALTER TABLE statements to change the column to a SQL Server system data type and change its collation, and then change the column back to an alias data type.

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.

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.

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 you add a column with a user-defined data type, we recommend that you define the column with the same nullability as the user-defined data type and specify a default value for the column.