Change data type from varchar to nvarchar for a table which has a large amount of data

Question

I need suggestions on how I would best go about changing a column's data type from varchar to nvarchar for a table which has 500 million records.

Thanks in advance.

Answer 1

You just need to issue an ALTER TABLE statement

ALTER TABLE YourTable ALTER COLUMN YourColumn nvarchar({required length});

You'll need to replace the section in braces ({}) and replace with your object names.