SQL SUM聚合问题

Question

ID Title Qty

1  BMW   2

2  VW    3

我想在一个SQL查询中查找数量之和并将其除以当前数量。 例如：

SUM (Qty) = 5，所以我想按公式计算分数。 2/5和3/5

ID title newscores
1  BMW   2/5
1  vW    2/5

Answer 1

Demo

 SELECT id
,title
,qty/(select sum(qty) from cars) 
FROM cars 
GROUP BY id

Answer 2

这应该有效

select title , sum (QTY) , t2.total, sum(QTY) / t2.total
from table , (select sum(QTY) as total from table) as t2
group by title

Answer 3

select id, title, qty/(select sum(qty) from make)
from make

请参阅SQLFiddle。

请注意，group by子句不需要任何内容​​。

Answer 4

SELECT ID, Title, CONCAT( Qty,  '/', (SELECT SUM( Qty) FROM table1) ) AS  'newscores'
FROM  `table1`