Be careful when updating records. If you omit the WHERE clause, ALL records will be updated!
Example
UPDATE Customers
SET ContactName='Juan';
SET ContactName='Juan';
The selection from the "Customers" table will now look like this:
| CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
|---|---|---|---|---|---|---|
| 1 |
Alfreds Futterkiste | Juan | Obere Str. 57 | Frankfurt | 12209 | Germany |
| 2 | Ana Trujillo Emparedados y helados | Juan | Avda. de la Constitución 2222 | México D.F. | 05021 | Mexico |
| 3 | Antonio Moreno Taquería | Juan | Mataderos 2312 | México D.F. | 05023 | Mexico |
| 4 |
Around the Horn | Juan | 120 Hanover Sq. | London | WA1 1DP | UK |
| 5 | Berglunds snabbköp | Juan | Berguvsvägen 8 | Luleå | S-958 22 | Sweden |
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