In SQL AlterTable Add Column is used to add a new column to the existing table. For this demonstration, we use the Customer.
Add Column Example
To add a new to the existing table, please use the following transact Alter table Add Column syntax.
ALTER TABLE [Table_Name] ADD [New_Column] Data_Type (Length) NULL | NOT NULL
Let me insert Sales that allows Nulls to an existing Customers
USE [NewNameDB] GO ALTER TABLE Customers ADD Sales MONEY NULL
Messages ------- Commands completed successfully.
Using Management Studio
From the Management Studio, right-click on the table, and select the Design.
Selecting the Design option will open the table in design mode. Let me insert a new col called Tax of Money data type.
Click the Close button will display the pop-up window. Please select the Yes button to save the changes.
Now you can see the newly included col called the tax.