====== 2.2 Query con Tabelle Collegate ======

Query SQL sui dati Gateway in Access.

===== Query Semplice =====

<code sql>
SELECT * FROM Customers
WHERE Country = 'Germany'
ORDER BY Name;
</code>

===== Join =====

<code sql>
SELECT c.Name, o.OrderDate, o.Total
FROM Customers AS c
INNER JOIN Orders AS o ON c.Id = o.CustomerId
WHERE o.OrderDate > #2024-01-01#;
</code>

===== Suggerimento Performance =====

I filtri vengono inoltrati al server - grandi quantita di dati non vengono caricate localmente.

===== Aggregazioni =====

<code sql>
SELECT Country, COUNT(*) AS Conteggio
FROM Customers
GROUP BY Country;
</code>