遍歷行和計數基於表名

Question

這是我的數據庫表：

Status 
------ 
Active 
Active 
Inactive 
Removed 
Removed 

我想要的輸出：

Status | Total | Percent 
------------------------------- 
Active | 2 | 33.33 
Inactive | 1 | 16.66 
Removed | 3 | 50 
Total | 6 | 100 

我已經嘗試：

SELECT 
    OrderStatus AS Status, 
    COUNT(OrderStatus) AS Total, 
    ROUND(((COUNT(OrderStatus) * 100)/COUNT(*)),2) AS Percent 
FROM 
    myTable 

對於顯而易見的原因，我的查詢不工作，任何幫助讚賞！

Answer 1

你錯過了group by子句，並且你需要的記錄總數，你可以使用子查詢得到劃分：

SELECT 
    OrderStatus AS Status, 
    COUNT(OrderStatus) AS Total, 
    ROUND((COUNT(OrderStatus) * 100)/(select COUNT(*) from myTable),2) AS [Percent] 
FROM 
    myTable 
Group by OrderStatus 

Answer 2

表中的總記錄分配給一個變量。這將防止它需要爲每條記錄重新計算。只有5條記錄的小問題，但是如果您將此邏輯應用於具有更多唯一值的較大表格，則差異應該變得明顯。

SQL：

declare @TempTable table([OrderStatus] varchar(50)) 

insert into @TempTable 
values 
('Active'), 
('Active'), 
('Inactive'), 
('Removed'), 
('Removed') 

DECLARE @TotalRecords int = (Select Count(*) from @TempTable) 

SELECT 
    OrderStatus AS Status, 
    COUNT(OrderStatus) AS Total, 
    ROUND((COUNT(OrderStatus) * 100)/@TotalRecords,2) AS [Percent] 
FROM 
    @TempTable 
Group by OrderStatus 

結果：

(5 row(s) affected) 
Status            Total  Percent 
-------------------------------------------------- ----------- ----------- 
Active            2   40 
Inactive           1   20 
Removed           2   40 

(3 row(s) affected)