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‘How to implement default constraints in the memory optimized table’ seems very simple to me and I tried to implement in the same way, as we usually do it in the disk based table. But the output was not as per the expectation. Let me show you the output.

USE hkNorthwind
GO
CREATE TABLE tbl_Product_Master
(
[Product ID] INT not null primary key nonclustered hash
with (bucket_count = 1024),
[Product Name] NVARCHAR(100),
[Creation Datetime] datetime default Getdate()
) WITH (MEMORY_OPTIMIZED = ON)
GO

Msg 10770, Level 16, State 13, Line 3
The feature ‘default constraints’ is not supported with memory optimized tables.

Oooops.. I am unable to create a default constraint in memory optimized table.

So, can we create a default constraint column in memory optimized table ? The answer is No & Yes.

Why No: Because you cannot create a default constraint column in memory optimized table.
Why Yes:Because you can implement the default constraint functionality in memory optimized table using stored procedure.

Let me create the table & stored procedure to implement default constraints in the memory optimized table.

Step 1 :
First of all, you need to create a memory optimized table without any default constraint.
Given below is the script.

USE hkNorthwind
GO
CREATE TABLE tbl_Product_Master
(
[Product ID] INT not null primary key nonclustered hash
with (bucket_count = 1024),
[Product Name] NVARCHAR(100),
[Creation Datetime] datetime
) WITH (MEMORY_OPTIMIZED = ON)
GO

Step 2 :
Once you have created the memory optimized table, create a stored procedure to insert records in it.

USE hkNorthwind
GO
CREATE PROCEDURE usp_Insert_Product_Master
@ProductID int,
@ProductName nvarchar(100)
AS
INSERT INTO tbl_Product_Master
([Product ID],[Product Name],[Creation Datetime])
VALUES (@ProductID,@ProductName,getdate())

Step 3 :
Insert the records using stored procedure in the memory optimized table.
Given below is the script.

USE hkNorthwind
GO
EXEC usp_Insert_Product_Master 1, 'SQL Server 2012'
GO
EXEC usp_Insert_Product_Master 2, 'SQL Server 2014'

Step 4 :
Just browse the table and check whether the default constraint is implemented or not.

USE hkNorthwind
GO
SELECT * FROM tbl_Product_Master
GO
--OUTPUT

Note : You can download the hkNorthwind database from here.

Reference : MSDN