If you want to set an default value for an existing column in SQL Server , you can use the ALTER command and specify the CONSTRAINT. How to set an default value for an existing column in SQL Server ? Assume that you have a table called HumanResource.Employee and wish to set the “holiday” column’s default value to 23 . Here’s how you do it. Use AdventureWorks GO ALTER TABLE HumanResource.Employee ADD CONSTRAINT DF_Constraint1 DEFAULT 23 FOR holiday
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