Question

我想根据我所做的转换来分离彩色作业：

select count(ap.id), 
       (count(ap.id)/cast(SUM(j.views) as float) * 100) as conversion,
       j.company_id 
  from applications ap 
          right join jobs j 
            on ap.job_id = j.id 
 where j.company_id = 61805
 group by j.id

如果转换列大于该结果总平均值的75％，我想创建新的别名列，值为绿色。如果转换列介于35％和75％之间，则列值将黄色且小于35％，列值将红色。

如上所述我可以提到postgres吗？提前谢谢。

Answer 1

窗口功能是你的朋友：

SELECT count,
       conversion,
       CASE
          WHEN conversion > avg_conv * 0.75
          THEN 'green'
          WHEN conversion < avg_conv * 0.35
          THEN 'red'
          ELSE 'yellow'
       END AS color,
       company_id
FROM (SELECT count,
             conversion,
             avg(conversion) OVER () AS avg_conv,
             company_id
      FROM (SELECT count(ap.id), 
                   (count(ap.id)/cast(SUM(j.views) as float) * 100) AS conversion,
                   j.company_id 
            FROM applications ap 
               RIGHT JOIN jobs j 
                  ON ap.job_id = j.id 
            WHERE j.company_id = 61805
            GROUP BY j.company_id
           ) with_avg
     ) with_color;

（未测试的）

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