Hi all, i have to optimize complex join queries. i am not able to understand how the complex queries gets executed. Whether it follow top-down or bottom-up approach. There is millions of data.
The queries is: select ucp.user_id as RESULTANT_ID from user_course_payment ucp,crm_sales_contact sc, crm_contacts c where c.contact_id=sc.contact_id and c.product_id = sc.product_id and sc.product_id=1 and sc.resultant_id =ucp.user_id and sc.resultant_id !='' and c.operator_id=1 and date_format(ucp.payment_date,'%Y-%m-%d') >= '2001-12-12' and date_format(ucp.payment_date,'%Y-%m-%d') <= '2007-12-12' GROUP BY ucp.user_id; Please help me. -Regards, Krishna
