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POSelect table entries belonging to combinations of entries in another table (mysql)
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  1. POSelect table entries belonging to combinations of entries in another table (mysql)
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    copied!<p>Regarding MySQL queries, how can I get all table entries that belong to combinations of entries in another table?</p> <p><em>Background:</em> I would like to count orders which consist of order items. Each order item has a state like 'canceled' or 'delivered'. There are partial deliveries, so that there can be both delivered and canceled orders in one order. I would like to count the net orders and I would like to know how many orders have items with more than one item status. </p> <pre><code>Order Number | Order Item | Status X0001 | Item | delivered X0001 | Item | delivered X0002 | Item | delivered X0002 | Item | canceled X0002 | Item | delivered X0003 | Item | delivered </code></pre> <p>I have 3 valid orders here and one order with delivered/canceled. How can I ask for all orders which have at least one delivered and one canceled item?</p> <p>As I am very new to MySQL I am basically looking for the right approach. Do I need subqueries or joints for this?</p> <p>Edit: First of all, sorry for the late reply. And sorry again because my question was obviously misleading.</p> <p>There are three tables involved: 'order', 'order_item' and 'order_item_status'.</p> <p>'order' and 'order_item' are linked through 'order_item.fk_order' and 'order.id_order'. </p> <p>'order_item' and 'order_item_status' are linked through 'order_item.fk_order_item_status' and 'order_item_status.id_order_item_status'. </p> <p>You have been very helpful so far but I am still a bit stuck as I do not know how to finally count by combination. The perfect result would be something like that:</p> <pre><code>{shipped} | 34 {canceled} | 12 {shipped, canceled} | 8 {closed, canceled} | 4 {closed} | 27 ... | ... </code></pre> <p>But I don't know how to deal with combinations in a query. Maybe you have some more helpful hints for me ...</p> <p>Thank you very much.</p>
 

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