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    <p>What you are trying to achieve is not very clear to me, but it looks very much like you just need to add some two-columns unique constraints.</p> <ul> <li>an <code>email</code> must be unique for one given <code>account_id</code>:</li> </ul> <pre class="lang-sql prettyprint-override"><code>ALTER TABLE your_table ADD UNIQUE (account_id, email); </code></pre> <ul> <li>a <code>phone number</code> must be unique for one given <code>account_id</code>:</li> </ul> <pre class="lang-sql prettyprint-override"><code>ALTER TABLE your_table ADD UNIQUE (account_id, phone); </code></pre> <p>Both indexes may exist at the same time on your table. Either could raise a "duplicate-key violation" error, and would trigger the <code>IGNORE</code> or the <code>ON DUPLICATE</code> clauses of your insertions.</p> <hr> <p>That being said, there is an issue in your structure. You are about to duplicate your customers' details for each <code>account_id</code> they are in business with.</p> <p>You should have a <code>customers</code> table that contains all your customer's contact details (and only that), another <code>accounts</code> table -- your "offices", if I understand it right -- and finally one relation table to model the <a href="http://en.wikipedia.org/wiki/Many-to-many_%28data_model%29" rel="nofollow">n-n relationship</a> between <code>customers</code> and <code>accounts</code>:</p> <pre><code>CREATE TABLE customers_accounts ( customer_id INT NOT NULL, account_id INT NOT NULL, PRIMARY KEY (customer_id, account_id), FOREIGN KEY (customer_id) REFERENCES customers(id) FOREIGN KEY (account_id) REFERENCES accounts(id) ); </code></pre>
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    1. CO+1 . . . Even though I've never seen "unicity" used in this context. Did you consider "uniqueness"?
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      1. USGordon Linoff
    2. COHaving checked the definition of "unicity" in English (vs. "unicité" in French), my wording was indeed quite amusing :) Thank you!
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