Question

我只是有这个查询，我想通过sum函数的结果添加其记录的顺序，如何添加？

 Select bus.trans_comp_id, 
 SUM(bus.passengers*trips.cost) 
 From bus inner join trips on bus.ID=trips.bus_id 
 group by bus.trans_comp_id

输出这个：

trans_comp_id  
 1)   1:412000.00
 2)   2:75000.00

我想用desc命令将其输出：

trans_comp_id  
 2)   2:75000.00
 1)   1:412000.00

Answer 1

您只需将SUM功能添加到ORDER BY caluse：

即可

Select bus.trans_comp_id, 
 SUM(bus.passengers*trips.cost) 
 From bus inner join trips on bus.ID=trips.bus_id 
 group by bus.trans_comp_id 
 order by SUM(bus.passengers*trips.cost) desc

Answer 2

只需添加一个ORDER BY子句，该子句使用SELECT子句中定义的计算值的别名：

 SELECT bus.trans_comp_id, 
        SUM(bus.passengers*trips.cost) AS s
 FROM bus 
 INNER JOIN trips ON bus.ID=trips.bus_id 
 GROUP BY bus.trans_comp_id
 ORDER BY s DESC

如何在查询中通过Sum函数添加订单？

2 个答案: