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Mysql 如何在SELECT查询中按两个总和/计数的比率排序？_Mysql_Select_Sql Order By - Fatal编程技术网
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Mysql 如何在SELECT查询中按两个总和/计数的比率排序？

mysql select

Mysql 如何在SELECT查询中按两个总和/计数的比率排序？,mysql,select,sql-order-by,Mysql,Select,Sql Order By,在中选择查询为 SELECT category_id, COUNT(*) AS Total, SUM(IF(year=2016,1,0) AS year2016, SUM(IF(year=2015,1,0) AS year2015 FROM articles GROUP BY category_id 如何按2016年/2015年的比率排序？将SELECT语句移动到子查询中将允许您重新使用计算的总和。转换为十进制将告诉MySQL不要使用整数除法，并将值保留在小数点的右侧 SELECT c

在
中选择
查询为


SELECT 
category_id, 
COUNT(*) AS Total, 
SUM(IF(year=2016,1,0) AS year2016, 
SUM(IF(year=2015,1,0) AS year2015
FROM articles
GROUP BY category_id



如何按
2016年/2015年的比率
排序？
将
SELECT
语句移动到子查询中将允许您重新使用计算的
总和。转换为
十进制
将告诉MySQL不要使用整数除法，并将值保留在小数点的右侧


SELECT category_id, Total, year2016, year2015
FROM
  (SELECT 
    category_id, 
    COUNT(*) AS Total, 
    SUM(IF(year=2016,1,0)) AS year2016, 
    SUM(IF(year=2015,1,0)) AS year2015
  FROM articles
  GROUP BY category_id) AS t
ORDER BY CAST(year2016 AS DECIMAL(14,4)) / CAST(year2015 AS DECIMAL(14,4))



按金额排序（如果（年份=2016,1,0）/SUM（如果（年份=2015,1,0）说明