SQL

default constraint in ms sql

/*Alter an existing column to add a default constraint*/
ALTER TABLE (Table_Name)
ADD CONSTRAINT (Constraint_Name)
DEFAULT (Default_Value) FOR (Existing_Column_Name)

default constraint in ms sql

/*Adding a New Column, with default value to an existing table*/
ALTER TABLE (Table_Name)
ADD (Column_Name)(Data_Type) (Null/NOT NULL)
CONSTRAINT (Constraint_Name) DEFAULT (Default_Value)

SQL DEFAULT Constraint

CREATE TABLE Persons (
    ID int NOT NULL,
    LastName varchar(255) NOT NULL,
    FirstName varchar(255),
    Age int,
    City varchar(255) DEFAULT 'Sandnes'
);