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- W3School - SQL Practice 3 (Null, Update, Delete) filename=exercise_null1 Exercise: Select all records from the Customers where the PostalCode column is SELECT * FROM Customers WHERE postalcode is null; Select all records from the Customers where the PostalCode
- W3School - SQL Practice 2 (Insert) Insert a new record in the Customers table. insert into Customers ( CustomerName, Address, City, PostalCode