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Relacionado 2. If a field in a table is optional, it is possible to insert a new record or update a record without adding a value to this field. Then, the field will be saved with a NULL value. A field with a NULL value is one that has been left blank during record creation!
Select all records from the Customers where the PostalCode column is empty. We just launched W3Schools videos. Get certified by completing a course today! If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:.
Exercise: Select all records from the Customers where the PostalCode column is empty.
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