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Pls copy your exact sql query in your database interface to see if it returns any data. Also try this simple sql query:
MyReport.php:
<?php
$this->src("mysql")
->query("SELECT company_name_en, country_code FROM clients")
->pipe($this->dataStore("clients"));
MyReport.view.php:
<?php
print_r($this->dataStore("clients")->data());
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