It is the WHERE clause that determines how many records will be updated.
The following SQL statement will update the PostalCode to 00000 for all records where country is "Mexico":
UPDATE Customers
SET PostalCode = 00000
WHERE Country = 'Mexico';
SET PostalCode = 00000
WHERE Country = 'Mexico';
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 | 12209 | 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 | WA1 1DP | UK |
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