Get Category Product relation table name dynamically Magento 2.

You can get the category product table name dynamically using Magento 2 Catalog module.

catalog_category_product table used for category-product relation.

The table contains entity_id, category_id, product_id and position field to manage relationships with products.

A class responsible to get the category table name is Magento\Catalog\Model\ResourceModel\Category.

<?php
namespace Rbj\Catalog\Model;

use Magento\Catalog\Model\ResourceModel\Category;

class CategoryProductTable
{
    /**
     * @var Category
     */
    private $category;;

    public function __construct(
        Category $category
    ) {
        $this->category = $category;
    }

    /**
     * category product table full name with prefix
     *
     * @return string
     */
    public function getCategoryProductTable()
    {
        $categoryProduct = $this->category->getCategoryProductTable();
        return $categoryProduct;
    }
}

call from template or other class,
echo $categoryProductTable = $this->getCategoryProductTable();

Output:
catalog_category_product (if prefix available, output is with prefix tablename)