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    <p>Something like:</p> <pre><code>SELECT [Customers].Customer_ID , COUNT(*) AS NumOrders FROM [Customers] INNER JOIN [Orders] ON [Orders].Customer_ID = [Customers].Customer_ID WHERE ([Customers].Gender = 'Female') GROUP BY [Customers].Customer_ID; </code></pre> <hr> <p>The <code>INNER JOIN</code> should be changed into <code>LEFT JOIN</code> <strong>to include Customers without any Orders</strong> (and <code>COUNT(*)</code> should be changed to <code>COUNT(Orders.Customer_ID)</code> as @onedaywhen spotted):</p> <pre><code>SELECT [Customers].Customer_ID , COUNT(Orders.Customer_ID) AS NumOrders FROM [Customers] LEFT JOIN [Orders] ON [Orders].Customer_ID = [Customers].Customer_ID WHERE ([Customers].Gender = 'Female') GROUP BY [Customers].Customer_ID; </code></pre> <p><strong>Note</strong>, that the above queries will give you <strong>number of Orders</strong> and not number of <strong>Products</strong> as you describe. You'll have to provide the structure of the tables (probably <code>Orders</code>, or <code>OrderDetails</code> if you have such a table) so we know where the information about products (and their orders) is stored.</p> <hr> <hr> <p>Sidenote: as (again, deserving more than half of these points :) @onedaywhen spotted, the <code>Customer_ID</code> is supposed to be the <code>PRIMARY KEY</code> of table <code>[Customers]</code>. If that's the case (or if it is <code>UNIQUE</code>), your original query could be simplified:</p> <pre><code>SELECT [Customers].Customer_ID FROM [Customers] WHERE [Customers].Gender = 'Female' ; </code></pre>
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    1. COFor your outer join suggestion presumably `COUNT(*)` should be changed to `COUNT(Orders.Customer_ID)`, otherwise a customer with zero orders would have the same count as a customer with one order.
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    2. CO@onedaywhen: Right, thnx.
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