SQL似乎在select語句中自動舍入數字？

Question

你好這裏是我的SQL代碼：

SELECT a."Date", a."Missed", b."Total Client Schedules", cast(100-((a."Missed"*100)/b."Total Client Schedules")AS decimal) as "Pct Completed" - 
    FROM - 
    (- 
    SELECT DATE(scheduled_start) as "Date",count(*) as "Missed" FROM - 
    events WHERE node_name IS NOT NULL AND status IN ('Missed') GROUP BY DATE(scheduled_start) - 
    ) as a, - 
    (- 
    SELECT DATE(scheduled_start) as "Date", count(*) as - 
    "Total Client Schedules" FROM events WHERE node_name IS NOT NULL GROUP BY DATE(scheduled_start) - 
    ) as b - 
    WHERE a."Date" = b."Date" ORDER BY "Date" desc 

，這裏是輸出

 Date   Missed  Total Client Schedules  Pct Completed 
-----------  ------------  -----------------------  -------------- 
2013-02-20    2       805    100 
2013-02-19    14       805     99 
2013-02-18    29       805     97 
2013-02-17    59       805     93 
2013-02-16    29       806     97 
2013-02-15    49       805     94 
2013-02-14    33       805     96 
2013-02-13    57       805     93 
2013-02-12    21       805     98 
2013-02-11    35       805     96 
2013-02-10    34       805     96 

它似乎總是舍入到最高數字時，我希望它像99.99％或97.2％等..

Answer 1

您不指定您正在使用的數據庫。但是，有些數據庫進行整數運算，所以1/2是0而不是0.5。

爲了解決這個問題，只是讓你使用數字而不是整數常量：

cast(100.0-((a."Missed"*100.0)/b."Total Client Schedules")AS decimal) 

然後它會轉換爲一個非整數類型算術。