計數值爲每種類型的

Question

我有以下表 用戶ID [nvarchar的（128）]，評分[VARCHAR（170）〕：值將主要1,2,3，但可以有例外

評分包含3個值[1,2或3]

我想要得到的結果類似

UserId Count(1's),Count(2's) Count(3's) 

1. 1001  10  8   2 
2. 1002  5  10  3 

是否有可能在一個查詢

Answer 1

做一個GROUP BY UserId來湊nt爲每個用戶ID。使用CASE數1級的，2的和3的分別：

select UserId, 
     count(case when Rating = 1 then 1 end) as [Count(1's)], 
     count(case when Rating = 2 then 1 end) as [Count(2's)], 
     count(case when Rating = 3 then 1 end) as [Count(3's)] 
from tablename 
group by UserId 

Answer 2

使用CASE聲明中的每個COUNT然後GROUP BY用戶ID。

SELECT UserId, COUNT(CASE WHEN value = '1' THEN 1 END) AS [Count(1's)], COUNT(CASE WHEN value = '2' THEN 1 END) AS [Count(2's)], COUNT(CASE WHEN value = '3' THEN 1 END) AS [Count(3's)] 
FROM yourtable 
GROUP BY UserId 

Answer 3

使用PIVOT：

SELECT 
    UserId, 
    COALESCE([1],0) [Count(1's)], 
    COALESCE([2],0) [Count(2's)], 
    COALESCE([3],0) [Count(3's)] 
FROM 
    ýour_table 
PIVOT 
    (COUNT([Rating]) 
FOR Rating 
    in([1],[2],[3]) 
)AS p 
ORDER BY 
    UserId