둘 이상의 필드로 주문 하시겠습니까?

Question

내가 내가 서브 쿼리를 사용하는 경우이 성능에 영향을 미치지 않는 종류의 created_on DESC 이메일 ASC

를 원하기 때문에 내가 서브 쿼리를 사용하고이 쿼리를

SELECT * FROM 
(SELECT u.id,u.email,u.verified,u.verified_on,u.created_on,ca.html AS age,cg.html AS gender,cs.html AS state 
FROM users u 
LEFT JOIN combo ca ON ca.combo_group='age' AND ca.value =u.age 
LEFT JOIN combo cg ON cg.combo_group='gender' AND cg.value =u.gender 
LEFT JOIN combo cs ON cs.combo_group='state' AND cs.value =u.state ORDER BY created_on DESC) users ORDER BY email ASC; 

있습니다.

Answer 1

왜 두 개의 필드로 주문하지 않습니까?

SELECT 
    u.id 
    ,u.email 
    ,u.verified 
    ,u.verified_on 
    ,u.created_on 
    ,ca.html AS age 
    ,cg.html AS gender 
    ,cs.html AS state 
FROM users u 
    LEFT JOIN combo ca ON ca.combo_group='age' AND ca.value =u.age 
    LEFT JOIN combo cg ON cg.combo_group='gender' AND cg.value =u.gender 
    LEFT JOIN combo cs ON cs.combo_group='state' AND cs.value =u.state 
ORDER BY created_on DESC, email ASC