<p>Je pense qu’un <code>UPDATE FROM</code> avec un <code>JOIN</code> vous aidera :</p>
<p>MS SQL</p>
<pre><code class="lang-auto">UPDATE
Sales_Import
SET
Sales_Import.AccountNumber = RAN.AccountNumber
FROM
Sales_Import SI
INNER JOIN
RetrieveAccountNumber RAN
ON
SI.LeadID = RAN.LeadID;
</code></pre>
<p>MySQL et MariaDB</p>
<pre><code class="lang-auto">UPDATE
Sales_Import SI,
RetrieveAccountNumber RAN
SET
SI.AccountNumber = RAN.AccountNumber
WHERE
SI.LeadID = RAN.LeadID;
</code></pre>