How do you change the datatype of a column in SQL Server?

sql-server tsql type-conversion alter-table

ALTER TABLE TableName ALTER COLUMN ColumnName NVARCHAR(200) [NULL | NOT NULL]

EDITAs noted NULL/NOT NULL should have been specified, see Rob's answer as well.

sql-server tsql type-conversion alter-table

Don't forget nullability.

ALTER TABLE <schemaName>.<tableName>ALTER COLUMN <columnName> nvarchar(200) [NULL|NOT NULL]

sql-server tsql type-conversion alter-table

Use the Alter table statement.

Alter table TableName Alter Column ColumnName nvarchar(100)

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