Following section demonstrates how to update from [Order] records,
which contains line that has value of quantity is lower 5 in [OrderDetails].
<sample>
    <pre lang="c#">
		// Table Aliases
        var t0 = new Orders().AsQueryable();
        var t1 = new OrderDetails().AsQueryable();

		var query = Odb.SQL.Update(x =>
							x.From(t0) 
							 {{hl}}.InnerJoin(t1, t1.OrderID == t0.OrderID){{/hl}}
							 .Where(t1.Quantity < 5)
							 {{hl}}.Set(t0.EmployeeID, 3){{/hl}}
					);

		var affected_rows = connection.Sql(query).NonQuery();
	</pre>
    <output>
        <hl>UPDATE</hl> t0<br />
        <hl>
            SET t0.EmployeeID=3
        </hl><br />
        FROM [Orders] AS t0<br />
        INNER JOIN [OrderDetails] AS t1<br />
        <span class="d-block ps-5">
            ON t1.OrderID = t0.OrderID
        </span>
        WHERE t1.Quantity < 5
    </output>
    <fiddle>ROYtZL</fiddle>
</sample>