Select all records from theCustomerswhere thePostalCodecolumn is empty. SELECT * FROM Customers WHERE; Submit Answer » Start the Exercise Video: SQL NULL Values ❮ PreviousNext ❯ W3schools Pathfinder Track your progress - it's free! Log inSign Up...
My SQL / Oracle (prior version 10G):ALTER TABLE Persons MODIFY COLUMN Age int NOT NULL; Oracle 10G and later:ALTER TABLE Persons MODIFY Age int NOT NULL; ❮ Previous Next ❯ W3schools Pathfinder Track your progress - it's free! Log in Sign Up ...