SQL: Checking ShippedDate Column For NULL

Retrieve records with NULL value in the ShippedDate column in the Orders table in Northwind

SELECT OrderID, ShippedDate
FROM Orders
WHERE ShippedDate IS NULL

Retrieve records that is does not have NULL value in the ShippedDate column in the Orders table in Northwind 

SELECT OrderID, ShippedDate
FROM Orders
WHERE ShippedDate IS NOT NULL

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