以防萬一-Oracle

Question

我有以下查詢：

select Type,

sum (case when a=1 then 1 end) as A,

sum (case when a=0 then 1 end) as B

這將顯示2列A，B及其總數。 我需要的是第三列，該列將顯示每行A和B的總和。 就像是：

Type       A         B      Total

Apple      5                  5

Orange     3         4        7

Kiwi       2         1        3

Peach                6        6

我已經嘗試了以下方法，但似乎不起作用：

select Type,

sum (case when a=1 then 1 end) as A,

sum (case when a=0 then 1 end) as B,

sum (A+B) as Total

Answer 1

您可以使用以下方法計算Total ：

select Type,
  sum(case when a=1 then 1 end)        as A,
  sum(case when a=0 then 1 end)        as B,
  sum(case when a IN (0,1) then 1 end) as Total
...

Answer 2

如果您只對0和1值感興趣，那么這可能會更簡單：

select Type, sum(a) as A, sum(1 - a) as B, count(*) as Total
from t
where a in (0, 1)
group by Type;