的SQL Server交叉联接查询

Question

我的下一个SQL Server表：

Machine | Result 
----------------- 
M2  | 0 
M1  | 1 
M3  | 0 
M1  | 1 
M2  | 1 
M1  | 0 
M2  | 0 
M1  | 1 
M3  | 0 
M1  | 1 
M3  | 0 

我需要得到像这样的报告：

Machine | Count 0's | Count 1's 
-------------------------------- 
M1  | 1  | 4 
M2  | 2  | 1 
M3  | 3  | 0 

我都试过，没有sucess下一个查询：

SELECT A, B 
FROM 
(SELECT COUNT(*) as A 
FROM MY_TABLE 
WHERE Result = 0) 
GROUP BY Machine) a 
CROSS JOIN 
(SELECT COUNT(*) as B 
FROM MY_TABLE 
WHERE Result = 1) 
GROUP BY Machine) b 

你能帮助我吗？提前致谢！

Answer 1

您可以有条件聚集做到这一点：

select machine, 
     sum(case when result = 0 then 1 else 0 end) as num_0, 
     sum(case when result = 1 then 1 else 0 end) as num_1 
from my_table 
group by machine;