INNER JOIN의 테이블 중 하나에서 고유 한 행 가져 오기

Question

zc_orders 테이블에있는 고유 한 행을 얻을 수있는 임시 해결책이 있습니까? 난 단지 zc_zc_orders_status_history (중복 행이)에서 의견 필드가 필요합니다.

SELECT 
zc_orders.orders_id, 
zc_orders_status_history.comments, 
zc_orders_status_history.orders_status_id, 
zc_customers.customers_email_address, 
zc_customers.customers_telephone, 
zc_customers.customers_firstname, 
zc_customers.customers_lastname, 
zc_orders_status_history.date_added, 
zc_orders.date_purchased 
FROM 
zc_customers 
INNER JOIN zc_orders ON zc_orders.customers_id = zc_customers.customers_id 
INNER JOIN zc_orders_status_history ON 
zc_orders_status_history.orders_id = zc_orders.orders_id 
where zc_orders_status_history.orders_status_id = 8 
ORDER BY zc_orders_status_history.date_added DESC 

Answer 1

SELECT DISTINCT 
zc_orders_status_history.comments, 
FROM 
zc_customers 
INNER JOIN zc_orders ON zc_orders.customers_id = zc_customers.customers_id 
INNER JOIN zc_orders_status_history ON 
zc_orders_status_history.orders_id = zc_orders.orders_id 
where zc_orders_status_history.orders_status_id = 8 
ORDER BY zc_orders_status_history.date_added DESC