Question

我在Symfony2网站上使用了以下查询，用于将最近的纬度和经度对定位到地图上的给定点。有一张桌子＆＃39; latlong＆＃39;它存储了这些对，以及一个表'fos_user_user＆＃39;它存储用户和“用户名”。存储有关这些用户的数据的表（这是我们从wordpress移动所有数据时的宿醉）。问题是它运行得非常慢 - 当我们在旧的WordPress网站上运行非常类似的查询时，它过去相当快。有没有人对如何优化它有任何想法？

SELECT 
  latlong.user AS id, 
  fos_user_user.username AS username, 
  latlong.lat AS lat, 
  latlong.lng AS lng, 
  fos_user_user.email_canonical AS email, 
  firstname.VALUE AS firstname, 
  lastname.VALUE AS lastname, 
  address1.VALUE AS address1, 
  address2.VALUE AS address2, 
  address3.VALUE AS address3, 
  postcode.VALUE AS postcode, 
  image.VALUE AS image, 
  (
    3959 * ACOS(
      COS(
        RADIANS('51.4424728')
      ) * COS(
        RADIANS(lat)
      ) * COS(
        RADIANS(lng) - RADIANS('7.2586558')
      ) + SIN(
        RADIANS('51.4424728')
      ) * SIN(
        RADIANS(lat)
      )
    )
  ) AS distance 
FROM 
  latlong 
  JOIN fos_user_user ON latlong.user = fos_user_user.id 
  LEFT JOIN usermeta AS firstname ON firstname.user_id = latlong.user 
  AND firstname.field_id = '15' 
  LEFT JOIN usermeta AS lastname ON lastname.user_id = latlong.user 
  AND lastname.field_id = '16' 
  LEFT JOIN usermeta AS image ON image.user_id = latlong.user 
  AND image.field_id = '11' 
  LEFT JOIN usermeta AS address1 ON address1.user_id = latlong.user 
  AND address1.field_id = '2' 
  LEFT JOIN usermeta AS address2 ON address1.user_id = latlong.user 
  AND address1.field_id = '3' 
  LEFT JOIN usermeta AS address3 ON address1.user_id = latlong.user 
  AND address1.field_id = '4' 
  LEFT JOIN usermeta AS postcode ON postcode.user_id = latlong.user 
  AND postcode.field_id = '5' 
  LEFT JOIN usermeta AS public ON public.user_id = latlong.user 
  AND public.field_id = '10' 
WHERE 
  public.value = 'YES' 
HAVING 
  distance < 25 
ORDER BY 
  distance ASC 
LIMIT 
  0, 5

优化复杂的SQL查询

0 个答案: