alter column sql

ALTER TABLE table_name 
ALTER COLUMN column_name new_data_type(size);

ALTER TABLE table_name
ALTER COLUMN column_name datatype;

-- Example
ALTER TABLE product
ALTER COLUMN description VARCHAR(250);

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

ALTER TABLE table_name 
ADD column_name datatype;

ALTER TABLE table_name
ALTER COLUMN column_name datatype;
--ex.
ALTER TABLE Customers
ADD Email varchar(255);

ALTER TABLE table_name

MODIFY column_name datatype; 

ALTER TABLE table_name
ALTER COLUMN column_name datatype;