Question

我需要获得每个MODEL的聚合结果，该结果总结了先前查询中先前过滤的项目的总数：

SELECT model, ratio, if(count(model)>=3,3,count(model)) AS gearcount 
FROM zfgearinv 
WHERE allocated = 0 AND sold = 0 
GROUP BY model, ratio 
ORDER BY model

在这个查询中，我只显示＆lt; = 3项，然后我只想显示那些项目的SUM PER MODEL：

MODEL     RATIO GEARCOUNT
ZF 220A   1.23  2
ZF 220A   1.53  3
ZF 220A   1.75  3
ZF 220A   2     1
ZF 220A   2.45  2
ZF 220V   1.5   3
ZF 220V   1.75  1
ZF 220V   2     3
ZF 220V   2.5   3

所以我的最终输出应该是：

MODEL     TOTAL
ZF 220A   11
ZF 220V   10

Answer 1

您需要做的就是使用外部查询包装该查询，其中您执行齿轮箱的总和

SELECT model as MODEL, SUM(gearcount) as TOTAL
FROM
(   SELECT model, ratio, if(count(model)>=3,3,count(model)) AS gearcount 
    FROM zfgearinv 
    WHERE allocated = 0 AND sold = 0 
    GROUP BY model, ratio
) t
GROUP BY model
ORDER BY model

mySQL SUM以前的分组查询

1 个答案: