Question

我正在进行的项目现在需要一个参考系统（目前他们有50K成员）。我决定在成员表中添加 ref 和 ref_id 字段。

成员表的结构;

id (int auto),
admin (enum (1,0)),
ref (enum (1,0)),
ref_id (int),
country_id (int),
city_id(int),
town_id(int),
totalRef (int),
fullName (varchar),
registrationDate (datetime)

我想列出两个日期之间有新成员的参考数据。我想提供更多细节，所以我也尝试在查询中添加国家，城市和城镇。我尝试了以下查询，但我不认为这是一个好的方法，考虑它需要很长时间才能加载;

SELECT m.id, m.fullName, m.country_id, m.city_id, m.town_id, m.totalRef,
(select name from country where country.id = m.country_id) as countryName,
(select name from city where city.id = m.city_id) as cityName,
(select name from town where town.id = m.town_id) as townName,
(select count(id) from members where members.ref_id = m.id AND ref_id > 0 AND registrationDate BETWEEN '2011.11.04 00:00:00' AND '2011.11.04 23:59:59') as newRef

FROM members as m 

WHERE

m.country_id = '224' AND 
m.city_id = '4567' AND
m.town_id = '78964' AND 
m.admin = '0' AND 
m.ref = '1' 

ORDER BY newRef DESC 
LIMIT 0, 25

如果你能帮助我解决这个问题，我将很高兴。提前谢谢。

Answer 1

像这样 -

SELECT
  m.id,
  m.fullName,
  m.country_id,
  m.city_id,
  m.town_id,
  m.totalRef,
  cnt.name countryName,
  ct.name cityName,
  t.name townName,
  m2.newRef
FROM members as m 
  LEFT JOIN country cnt
    ON cnt.id = m.country_id
  LEFT JOIN city ct
    ON ct.id = m.city_id
  LEFT JOIN town t
    ON t.id = m.town_id
  LEFT JOIN (
    SELECT ref_id, COUNT(id) newRef FROM members
      WHERE ref_id > 0 AND registrationDate BETWEEN '2011.11.04 00:00:00' AND '2011.11.04 23:59:59'
      GROUP BY ref_id
    ) m2
    ON m2.ref_id = m.id
WHERE
  m.country_id = '224' AND 
  m.city_id = '4567' AND
  m.town_id = '78964' AND 
  m.admin = '0' AND 
  m.ref = '1' 
ORDER BY
  newRef DESC 
LIMIT
  0, 25;

计算来自同一成员表的两个日期之间的新成员

1 个答案: