sql server alter column

1ALTER TABLE table_name
2ALTER COLUMN column_name datatype;
3
4-- Example
5ALTER TABLE product
6ALTER COLUMN description VARCHAR(250);

1ALTER TABLE Customers
2ADD Email varchar(255);
3

1ALTER TABLE table_name 
2ALTER COLUMN column_name new_data_type(size);
3

1ALTER TABLE dbo.doc_exa 
2ADD column_b VARCHAR(20) NULL, 
3	column_c INT NULL ;

1ALTER TABLE table_name
2  ALTER COLUMN column_name column_type;

1ALTER TABLE `Table Name` MODIFY COLUMN `Column Name` Datatype(Size);