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    <p>I would just create two new tables <code>ItemProcurement</code> and <code>Currencies</code>.</p> <p>If I'm not wrong, as per the data presented, the amount is part of the procurement of the item itself (when the item has not been inherited), for that reason I would group the <code>Amount</code> and <code>CurrencyID</code> fields in the new entity <code>ItemProcurement</code>.</p> <p>As you can see, an inherited item wouldn't have an entry in the <code>ItemProcurement</code> table.</p> <p>Concerning the main <code>Item</code> table, if you expect just two different values for the kind of procurement, then I would use a <code>char(1)</code> column (varying from <code>B</code> => bougth, <code>I</code> => inherited).</p> <p>I would looks like this:</p> <p><img src="https://i.stack.imgur.com/LPiyY.png" alt="enter image description here"></p> <p>The data would then look like this:</p> <pre><code>TABLE Items +-------+-------+--------------------+ | ID | Mass | ProcurementMethod | |-------+-------+--------------------+ | 0 | 2 | I | +-------+-------+--------------------+ | 1 | 13 | B | +-------+-------+--------------------+ | 2 | 5 | B | +-------+-------+--------------------+ TABLE ItemProcurement +--------+-------------+------------+ | ItemID | CurrencyID | Amount | |--------+-------------+------------+ | 1 | 840 | 47.20 | +--------+-------------+------------+ | 2 | 826 | 3.10 | +--------+-------------+------------+ TABLE Currencies +------------+---------+-----------------+ | CurrencyID | ISOCode | Description | |------------+---------+-----------------+ | 840 | USD | US dollars | +------------+---------+-----------------+ | 826 | GBP | British Pounds | +------------+---------+-----------------+ </code></pre>
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    1. PONormalizing a Table 6
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    1. USLuis Quijada
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    1. COThis answer is best. Upvoted. Nice job, Luis Quijada.
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    2. COThis allows you to procure more than one of the same item type, at different costs and different currency types. I missed that but.
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