transact sql add column code example

Example 1: sql add column

ALTER TABLE Customers
ADD Email varchar(255);

Example 2: create column sql server

ALTER TABLE table_name
ADD column_name datatype;

Example 3: sql server add column

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

Example 4: sql alter table

-- With check if field already exists

IF NOT EXISTS(SELECT 1 FROM sys.columns 
          WHERE Name = N'Email'
          AND Object_ID = Object_ID(N'dbo.Customers'))
BEGIN    
	ALTER TABLE Customers
    ADD Email varchar(255);
END