grexican

If you’ve ever needed your ACF choices to be dynamically generated by a SQL query, this plugin will help you get the job done.
You can mix and match static choices with dynamic, SQL-based choices by placing as many regular choices in the list as you’d like, followed by the special <code>%%QUERY%%</code> choice that will tell this plugin to load choices dynamically from the database.
An example on how to list users, setting the <code>id</code> as the value, would look like this:
<pre><code>%%QUERY%% : SELECT user_nicename AS text, id AS value FROM wp_users
</code></pre>
<h3>Arbitrary section</h3>

ACF Dynamic Choices

Advanced Custom Fields plugin to allow for dynamic choices (through SQL queries)

Fabricio Carella

This plugin will allow you to execute any type of SQL query into the WordPress’s DB connecting through the driver provided by the MySQLi extension without the need to use another tool like phpMyAdmin.
It also gives you the ability to export the results in a CSV format file.
In order to access this plugin’s admin page (Tools -> Run SQL Query), your account needs to have the <code>install_plugins</code> capability, that means a Super Admin in the multi-site installation or an Admin in a single site.
Feel free to contribute: 
https://github.com/Sefirost/run-sql-query
Use on you own risk. Under no circumstances will the Author of this plugin assume responsibility or liability for any damages or destructive effects on the database resulting from the queries executed using this tool.

Run SQL Query

Run SQL Query is a simple plugin to quickly execute any type of SQL query into the WordPress's DB and export the results in a CSV format file.

ACF Dynamic Choices vs Run SQL Query