How to get data from 2 database tables and show them in the custom frontend page? I have been looking for the tutorials, so far what i get is creating SQL Left Join in the Collection.php (even though i do not know whether this is working or not)

namespace Namespace\Modulename\Model\Resource\Modulename;

use Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection;

class Collection extends AbstractCollection
     * Define model & resource model
    const YOUR_TABLE = 'tablename';

    public function __construct(
        \Magento\Framework\Data\Collection\EntityFactoryInterface $entityFactory,
        \Psr\Log\LoggerInterface $logger,
        \Magento\Framework\Data\Collection\Db\FetchStrategyInterface $fetchStrategy,
        \Magento\Framework\Event\ManagerInterface $eventManager,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\DB\Adapter\AdapterInterface $connection = null,
        \Magento\Framework\Model\ResourceModel\Db\AbstractDb $resource = null
    ) {
            $entityFactory, $logger, $fetchStrategy, $eventManager, $connection,
        $this->storeManager = $storeManager;
    protected function _initSelect()

                ['secondTable' => $this->getTable('tablename')],
                'main_table.columnname = secondTable.columnname',
  • what is the issue available after use above query? – Rakesh Jesadiya Oct 25 '16 at 4:55
  • @Rakesh well that query is an answer from magento.stackexchange.com/a/124204/44801, but that was for creating admin grid that only leave Collection and di.xml, whereas what i need is display data to the frontend page. So i haven't tried above code – Seventh St Oct 25 '16 at 6:52

here is a sample for join to product collection

protected $productCollectionFactory;

public function __construct(
        \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory,
    ) {
        $this->productCollectionFactory = $productCollectionFactory;

   public function getCollection()
    $collection = $this->productCollectionFactory->create();
                'e.entity_id = productsold.product_id',
    return $collection;   

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