SQL（Oracle） - 如何從兩個計數語句中獲得比率？

Question

我想得到count1 / count2的比率
這讓我符合百分比。 這就在我的指尖下面......
我可以得到一些幫助嗎？

Select 
 (
 Select Count (*) from tso_skf_nomeas_in60days_v 
 ) as count1, 
 (
 Select Count (*) from tso_skf_recent_meas
 ) as count2
 (
 from dual

Answer 1

你非常接近：

Select 
    (Select Count (*) from tso_skf_nomeas_in60days_v) 
    / 
    (Select Count (*) from tso_skf_recent_meas) as perc
from dual

SQL小提琴演示

Answer 2

SELECT
(SELECT cast(COUNT(*) as float) FROM tso_skf_nomeas_in60days_v)
/
(SELECT cast(COUNT(*) as float) FROM tso_skf_recent_meas) as perc
FROM dual

Answer 3

更新答案：

Select Count1/Count2
FROM (Select Count(*) Count1 From tso_skf_nomeas_in60days_v) tso_skf_nomeas_in60days_v,
(Select Count(*) Count2 From tso_skf_recent_meas) tso_skf_recent_meas;

正如在SQL Fiddle上看到的那樣。

最終結果：