算术运算

我有以下数据算术运算

Tid Did value 
------------------ 
1  123 100 
1  234 200 
2  123 323 
2  234 233

所有TIDS有一个表DIDS 123和234.因此，对于具有分布式入侵检测系统123和234我想计算value of did 123/value of did 234 * 100每TID即100/200 * 100 对于TID 2它将value of did 123/value of did 234 * 100即233分之323* 100

输出表将是

Tid result 
------------------ 
1  100/200 * 100 
2  323/233 * 100

任何帮助？

来源

2017-07-17 Ritesh

select tid, 
     100 * sum(case when did = 123 then value end)/
      sum(case when did = 234 then value end) 
from your_table 
group by tid 
having sum(case when did = 234 then value end) > 0

来源

2017-07-17 09:31:38

在这里，如果do 234的值等于零 – Ritesh

那么应该怎么办呢？你想从结果中排除这些记录吗？ –

是的，我希望通过添加where子句，这是哪里值<> 0.是否正确吗？ – Ritesh

JOIN的 “123” 的行与 “234” 的行：

select t123.tid, t123.value * 100/t234.value 
from 
    (select tid, value from tablename where value = 123) t123 
join 
    (select tid, value from tablename where value = 234) t234 
    on t123.tid = t234.tid

来源

2017-07-17 09:36:06 jarlh

JOIN，所有在ON

select t123.tid, t123.value * 100/t234.value 
from tablename t123 
join tablename t234 on t123.tid = t234.tid and t123.did = 123 and t234.did = 234

来源

2017-07-17 09:40:25 Serg

下面是该查询。我们可以使用内部连接来实现它。

SELECT T1.Tid,(T1.value/T2.value)*100 AS Result 
FROM Table_1 AS T1 
INNER JOIN 
Table_1 AS T2 
ON (T1.Tid = T2.Tid) 
AND (T1.Did <> T2.Did) 
AND T1.Did = 123

来源

2017-07-17 09:42:11 RBT

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