Default Constraint | DEFAULT Constraint in SQL - sql - sql tutorial - learn sql

• The DEFAULT constraint is used to provide a default value for a column.
• The default value will be added to all new records IF no other value is specified.
• The DEFAULT constraint provides a default value to a column when the INSERT INTO does not provide a specific value.

• For example, if we create a table as below:

CREATE TABLE Employee
(Employee_ID integer Unique, 
Last_Name varchar (30), 
First_Name varchar (30), 	
Score Integer DEFAULT 80);

• and execute the following SQL statement

INSERT INTO Employee (Employee_ID, Last_Name, First_Name) VALUES (10, 'Johnson', 'Rick');

• The table will look like the following

Employee _ID	Last_Name	First_Name	Score
10	Johnson	Rick	80

• Even though we didn't specify a value for the "Score" column in the INSERT INTO statement, it does get assigned the default value of 80 since we had already set 80 as the default value for this column.

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