php - 对如何组合两个查询的结果感到困惑

Question

查询一：

SELECT count(id) as conversions, SUM(user_payout) as amount, geoip.country_name, geoip.country_code
FROM conversions
LEFT JOIN geoip ON conversions.end_ip BETWEEN geoip.start_long AND geoip.end_long
WHERE user_id = 1
AND type != ''
AND status = 1
AND month(created_at) = month(now())
GROUP BY country_name
ORDER BY country_name ASC

结果：

查询 2：

SELECT count(id) as clicks, geoip.country_name, geoip.country_code
FROM clicks
LEFT JOIN geoip on clicks.ip BETWEEN geoip.start_long AND geoip.end_long
WHERE user_id = 1
AND month(created_at) = month(now())
GROUP BY country_name
ORDER BY country_name ASC

结果：

我想将两者结合起来，以便为每个国家/地区显示点击次数、转化次数、国家名称和国家代码。

无法弄清楚如何做到这一点。

谢谢！

Answer 1

您可以使用子查询和组合它们left outer join：

select clicks.country_code, clicks.country_name,
       coalesce(clicks.clicks, 0) as clicks,
       coalesce(conversions.conversions, 0) as conversions
from (<subquery 2>) clicks left outer join
     (<subquery 1>) conversions
     on clicks.country_code = conversions.country_code;

这假设所有国家/地区都至少有一次点击。

编辑：

如果国家/地区列表在 中geo_ip，您可以执行以下操作：

select gi.country_code, gi.country_name, clicks.clicks, conversions.conversions
from (select distinct country_code, country_name
      from geo_ip
     ) gi left outer join
     (<subquery 2>) clicks
     on clicks.country_code = gi.country_code left outer join
     (<subquery 1>) conversions
     on conversions.country_code = gi.country_code;

Answer 2

Left Join 点击第一个查询到 geoip。

或者您可以使用联合，但您只能通过仅在 select 语句中选择这些结果来获取每个结果以仅显示点击次数、转化次数、国家名称和国家代码。