mysql> SELECT COUNT(DISTINCT p.product_id) AS total FROM oc_product p LEFT 
JOIN oc_product_description pd ON (p.product_id = pd.product_id) LEFT JOIN 
oc_product_to_store p2s ON (p.product_id = p2s.product_id) LEFT JOIN 
oc_product_to_category p2c ON (p.product_id = p2c.product_id) WHERE 
pd.language_id = '1' AND p.status = '1' AND p.date_available <= NOW() 
AND p2s.store_id = '0' AND (p2c.category_id = '2101'); 
+-------+
| total |
+-------+
|    19 |
+-------+
1 row in set (15.58 sec)

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