計數除以計數

Question

如何將計數除以另一個計數。我看到了一些不同的方法，但我無法讓他們爲我的目的工作。我目前使用的代碼是：

Select(select COUNT(lUsers) 
     FROM Tlocation 
     WHERE dLastUpdated IS NOT NULL 
      AND dRemovalDate BETWEEN DATEADD(day,-7,GETDATE()) and GETDATE()) 
       /
      (SELECT COUNT(lUsers) 
     FROM Tlocation 
     WHERE dLastUpdated < GETDATE() 
      AND dRemovalDate IS NULL OR dRemovalDate > GETDATE()) 

但是這只是每次都返回一個0。

Answer 1

這是因爲該值小於INT（COUNT（）返回）。這裏是你如何能做到這一點：

SELECT 
    (
     SELECT 1562 
    ) 
    /
    CAST(
     (
      SELECT 92825 
     ) 
     AS DECIMAL(20, 10) 
    ) 
; 

或者您的查詢：

Select(select COUNT(lUsers) 
     FROM Tlocation 
     WHERE dLastUpdated IS NOT NULL 
      AND dRemovalDate BETWEEN DATEADD(day,-7,GETDATE()) and GETDATE()) 
       /
      CAST(
        (SELECT COUNT(lUsers) 
       FROM Tlocation 
       WHERE dLastUpdated < GETDATE() 
        AND dRemovalDate IS NULL OR dRemovalDate > GETDATE()) 
      AS DECIMAL(20, 10) 
      ) 
;