我的Select Case出现问题，输出无效

Question

SELECT date,
       (CASE country WHEN 'France' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS france,
       (CASE country WHEN 'Germany' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS germany,
       (CASE country WHEN 'Italy' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS italy,
       (CASE country WHEN 'Netherlands' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS netherlands,
       (CASE country WHEN 'Nordic' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS nordic,
       (CASE country WHEN 'Spain' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS spain,
       (CASE country WHEN 'UK' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS uk
FROM report_adherence_daily
WHERE date>= '2016-07-04'
  AND date<= '2016-07-10'
GROUP BY date,
         country

上面是我的代码，用于将数据转换为我需要的格式，但结果显示为

。

我缺少的是使结果看起来像

的额外位

。

我试图在案件之前和案件中使用max并且没有工作。如果我仅按日期分组，我会丢失大部分数据，这与分组按国家/地区相同。我错过了什么？

Answer 1

您想要条件聚合，但case需要进入sum()，而不是在SELECT date, (100 * sum(case when country = 'France' then duration end) / sum(case when country = 'France' then scheduled end) ) as france, . . . FROM report_adherence_daily WHERE date >= '2016-07-04' AND date <= '2016-07-10' GROUP BY date ORDER BY date; 之外：

package my.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;
import javax.validation.constraints.Pattern;

import static org.springframework.web.bind.annotation.RequestMethod.GET;

@RestController
public class MyController {

    private static final String VALIDATION_REGEX = "^[0-9]+(,[0-9]+)*$";

    @RequestMapping(value = "/my/{id}", method = GET)
    public myResonseObject getMyParams(@PathVariable("id") String id,
                                       @Valid @Pattern(regexp = VALIDATION_REGEX) 
                                       @RequestParam(value = "myparam", required = true) String myParam) {
         // Do Stuff!
    }

}

Answer 2

那么可能是子查询？

SELECT date, MAX(france), MAX(germany), MAX(italy), MAX(netherlands), MAX(Nordic), MAX(spain)
FROM 
   (
       SELECT date,
           (CASE country WHEN 'France' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS france,
           (CASE country WHEN 'Germany' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS germany,
           (CASE country WHEN 'Italy' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS italy,
           (CASE country WHEN 'Netherlands' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS netherlands,
           (CASE country WHEN 'Nordic' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS nordic,
           (CASE country WHEN 'Spain' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS spain,
           (CASE country WHEN 'UK' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS uk
       FROM report_adherence_daily
       WHERE date>= '2016-07-04'
         AND date<= '2016-07-10'
       GROUP BY date,
                country
   )
GROUP BY date

我暂时没有使用mySql，我无法测试它。 ：（

Answer 3

嗯，你已经硬编了国名，所以这不是那么糟糕......

SELECT 
  Date, 
  Sum(France) as France, 
  Sum(Germany) as Germany,
  Sum(Italy) as Italy,
  Sum(Netherlands) as Netherlands,
  Sum(Nordic) as Nordic,
  Sum(Spain) as Spain,
  Sum(Uk) as UK
FROM
(
SELECT date,
       (CASE country WHEN 'France' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS france,
       (CASE country WHEN 'Germany' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS germany,
       (CASE country WHEN 'Italy' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS italy,
       (CASE country WHEN 'Netherlands' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS netherlands,
       (CASE country WHEN 'Nordic' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS nordic,
       (CASE country WHEN 'Spain' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS spain,
       (CASE country WHEN 'UK' THEN (sum(duration) / sum(scheduled))*100 ELSE 0 END) AS uk
FROM report_adherence_daily
WHERE date>= '2016-07-04'
  AND date<= '2016-07-10'
GROUP BY date,
         country
)SUB_Q
GROUP BY Date