Be careful when updating records. If you omit the WHERE clause, ALL records will be updated!
UPDATE Customers
SET PostalCode = 00000;
SET PostalCode = 00000;
The selection from the "Customers" table will now look like this:
| CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
|---|---|---|---|---|---|---|
| 1 |
Alfreds Futterkiste | Alfred Schmidt | Obere Str. 57 | Frankfurt | 00000 | Germany |
| 2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 00000 | Mexico |
| 3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 00000 | Mexico |
| 4 |
Around the Horn | Thomas Hardy | 120 Hanover Sq. | London | 00000 | UK |
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